How long has it been since you’ve taken a good look at Mercury? For the backyard astronomer, all we’ll ever see is the speedy little planet as a bright crescent a few times a year. But, for the MESSENGER spacecraft, Mercury isn’t quite as boring as you might think! Some strange new features have been spotted and a planetary geologist speculates they could be attributed to hydrogen venting from the planet’s interior.
While it’s only been a week since MESSENGER sent back some curious photos of Mercury’s surface, the revelation has created quite a stir in the planetary science community. These observations have included evidence of shallow depressions which have formed into non-uniform crater structures which appear to be recent. In addition, they have a high albedo – indicative of some sort of reflective material. But, what?
According to Marvin Herndon, an independent scientist based in San Diego, Mercury formed under great pressure and high temperature – enough to leave iron in a molten state. If so, it should be responsible for absorbing large amounts of hydrogen. As it cools and transforms to a solid state, the hydrogen is then released, forming a type of “geyser” on the planet’s surface.
“These hydrogen geysers could certainly have caused the rimless depressions that MESSENGER sees.” says Herndon, a self-proclaimed maverick in the world of planetary geology.
As the hydrogen is released from below the planet’s surface, it would also react with other elements it would encounter – possibly iron sulphide, commonly found on Mercury’s surface. This would cause a reduction to metallic iron. From there it would form a light “dust” which could account for the bright, new features seen by MESSENGER.
A light-hearted moment is shared between Apollo 12 Lunar Module Pilot Alan Bean (standing) and Apollo 11 Lunar Module Pilot Buzz Aldrin. Photo Credit: ASF
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CAPE CANAVERAL, Fla – It all started – with seven. The original seven Mercury astronauts that is. They wanted to give back to the nation that had allowed them to reach the heights that they had achieved, while at the same time inspiring the nation’s young to follow in their footsteps. What arose was the Astronaut Scholarship Foundation (ASF).
There are more than 80 astronauts that are working with the ASF to ensure that the United States maintains its role as leader in terms of science and technology. The ASF accomplishes this by providing scholarships to students studying engineering, science and math.
Apollo 14 Lunar Module Pilot Edgar Mitchell poses with a guest during a previous ASF astronaut autograph show. Just over his shoulder is former shuttle astronaut Fred Gregory. Photo Credit: ASF
In 1984, the then six surviving Mercury astronauts established the 501 (c) 3 organization along with the widow of the seventh (Betty Grissom, widow of astronaut Virgil “Gus” Grissom. Astronauts Malcolm Scott Carpenter, L. Gordon Cooper Jr., John H. Glenn Jr., Walter M. Schirra, Alan B. Shepard Jr., and Donald K. (Deke) Slayton were also joined by the Mercury Program’s flight surgeon William Douglas M.D. as well as a local business man, Henry Landwirth.
What started with scholarships of only $1,000 has grown to $10,000 each. Twenty-six of these scholarships are handed out every year for a grand total of $260,000. All total? The ASF has handed out $3 million in scholarships to worthy students. The ASF’s current Chairman of its Board of Directors is Apollo 16 Command Module Pilot Charlie Duke; his vice-chair is shuttle veteran Dan Brandenstein.
Apollo 15 Commander Dave Scott poses with a young guest at the ASF's astronaut autograph show. Photo Credit: ASF
The ASF raises funds by a number of means. Astronaut guest appearance, fund-raisers, donations from different entities both public and private and autograph shows. The next of these is scheduled to take place at the Kennedy Space Center Visitor Complex located in Florida from Nov. 4-6. The annual show contains a wide range of events and tours to allow guests the opportunity to learn about the location’s history while picking up a signed item from an astronaut.
Former shuttle astronaut Robert Springer flew twice on the space shuttle and is a current member of the Astronaut Scholarship Foundation. Photo Credit: NASA.gov
Universe Today recently sat down with two-time shuttle veteran Robert C. Springer about his thoughts regarding ASF. Here is what he had to say:
Universe Today: Hi Bob thanks for chatting with us today.
Springer: “My pleasure, thanks for having me!”
Universe Today:How long have you been affiliated with the ASF and how do you view its activities?
Springer: “I have been associated with the Astronaut Scholarship Foundation for the past ten years. The foundation has had phenomenal success, increasing the number of scholarships to the current level of 26 scholarships, each in the amount of $10,000 awarded annually to young men and women who are pursuing degrees in engineering and scientific fields that are related to space exploration.”
Universe Today:What do you find most rewarding or interesting regarding the ASF’s efforts?
Springer: “One of the most interesting aspects of the fund raising effort, is the diversity of individuals who have contributed to the foundation. It has been both a national and international group of individuals who truly believe that we need to continue to invest in our future by providing funding assistance to talented and motivated students to enable them to continue their studies in selected fields.”
Universe Today:So your experience with these folks is rewarding?
Springer: “They are great, but it’s really wonderful to meet the recipients of these scholarships – each year we have the opportunity to hear from some of the individuals who have been awarded the scholarships, and it is remarkable to hear their stories and to understand the kinds of contributions they are making today and have the potential to make in the future.”
Universe Today:I bet that must be really gratifying. It seems we have to wrap, but I wanted to thank you for telling us a bit about your experiences.
Springer: “It was great talking with you!”
For more information regarding the Astronaut Scholarship Foundation’s annual autograph show visit: astronautscholarship.org or call: 321-455-7016. The ASF astronaut autograph show is normally held during the first week in November and serves to raise funds for scholarships. Photo Credit: ASF
United Launch Alliance's Delta II rocket has been added to the National Launch Services II contract by NASA. Photo Credit: Alan Walters/awaltersphoto.com
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NASA announced that it has added the Delta II rocket, a launch vehicle that appeared to be slipping into history, to the NASA Launch Services (NLS) II contract. The Delta II, produced by United Launch Alliance, is one of the most successful expendable launch vehicles that has ever been produced.
This modification of the contract will allow ULA to add the Delta II rocket as part of the contract’s on-ramp provision. The modification allows United Launch Services to offer as much as five Delta II rockets.
The Delta II was most recently utilized to launch the GRAIL mission to study the Moon's composition. Photo Credit: Mike Killian/ARES Institute
“We are extremely pleased NASA has added the reliable Delta II to the NLS II contract and look forward to continuing the legacy of the program,” said Michael Gass, ULA’s president and CEO. “ULA has demonstrated its ability to fully integrate Atlas V, Delta IV and Delta II product lines allowing us to continue offering medium launch capability at the best value for our customers.”
The Delta II rocket, in its various configurations has been launched 150 times and has a success rate of 98.7 percent. The one notable failure was the 1997 launch of a U.S. Air Force Global Positioning IIR-1 satellite (GPS IIR-1). Within 13 seconds of launch the Delta II exploded causing severe destruction to the surrounding area. The cause of this mishap was determined to be a crack within one of the GEM-40 solid rocket boosters that are affixed to the base of the Delta II.
The Delta II rocket has a very extensive history of success and has been used to launch many famous missions. Image Credit: NASA/JPL
“While we count success one mission at a time, we have been able to count on the Delta II’s success 96 times in a row over the last decade,” Gass said. “This is a tribute to our dedicated ULA employees, our supplier teammates and our NASA Launch Services Program customer who ensures mission success is the focus of each and every launch.”
The planetary science missions that the rocket has sent into space reads like a “Who’s Who” of space exploration missions. The Mars Exploration Rovers Spirit and Opportunity, Mars Phoenix Lander, Genesis, Stardust, Mars Pathfinder, Mars Global Surveyor, Messenger, Deep Impact, Dawn, Kepler, Wise and the recent GRAIL mission to the Moon – all thundered to orbit atop a Delta II.
The Delta II rocket is launched from either Vandenberg Air Force Base in California or Cape Canaveral Air Force Station located in Florida. Photo Credit: NASA.gov
ULA’s next planned launch of a Delta II will carry the NPOESS Preparatory Project (NPP) mission for NASA. It is currently slated to launch Oct. 25, 2011 from Space Launch Complex-2 at Vandenberg Air Force Base, located in California. ULA launches from both Vandenberg as well as Cape Canaveral Air Force Station, located in Florida.
While this change does allow for at least five more launches of the Delta II, after those launches, the rocket will no longer be utilized and will be phased out of service.
The NLS II contracts are designed to provide for payloads weighing about 550 pounds or more to be sent to a minimum 124-mile-high circular orbit. The launch service providers signed into these contracts also may offer different launch vehicles to NASA to meet other requirements. NASA can also provide launch services to other agencies, such as the National Oceanic and Atmospheric Administration or NOAA.
Spirit and Opportunity, Pathfinder, Deep Impact, Dawn, Kepler, Stardust, Genesis and Wise - were all launched on the Delta II rocket. Photo Credit: NASA/George Shelton
Planet Mercury as seen from the MESSENGER spacecraft in 2008. Credit: NASA/JPL
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According to data from the The Fast Imaging Plasma Spectrometer (FIPS) onboard NASA’s MESSENGER spacecraft, the solar wind is “sandblasting” the surface of Mercury at its polar regions.
Based on findings from one of seven different papers from the MESSENGER mission to be published in the Sept. 30th edition of Science, sodium and oxygen particles are charged in a manner similar to Earth’s own Aurora Borealis.
How are the University of Michigan researchers able to detect and study this phenomenon?
Using the FISP, the scientists at the University of Michigan have taken measurements of Mercury’s exosphere and magnetosphere. The data collected has provided researchers with a better understanding of interactions between Mercury and our Sun. FIPS data has also confirmed theories regarding the composition and source of particles in Mercury’s space environment.
“We had previously observed neutral sodium from ground observations, but up close we’ve discovered that charged sodium particles are concentrated near Mercury’s polar regions where they are likely liberated by solar wind ion sputtering, effectively knocking sodium atoms off Mercury’s surface,” said FIPS project leader Thomas Zurbuchen (University of Michigan).
In a UM press release, Zurbuchen added, “We were able to observe the formation process of these ions, and it’s comparable to the manner by which auroras are generated in Earth’s atmosphere near polar regions.”
Given that Earth and Mercury are the only two magnetized planets in the inner solar system (Mars is believed to have had a magnetic field in its past), the solar wind is deflected around them. The solar wind has made recent news due to recent outbursts from the Sun causing visible aurorae, caused by the interaction of charged particles from the Sun and Earth’s relatively strong magnetosphere. While Mercury does have a magnetosphere, compared to Earth’s it is relatively weak. Given Mercury’s weak magnetosphere and close proximity to the Sun, the effects of the solar wind have a more profound effect.
The Fast Imaging Plasma Spectrometer on board MESSENGER has found that the solar wind is able to bear down on Mercury enough to blast particles from its surface into its wispy atmosphere. Image Credit: Shannon Kohlitz, Media Academica, LLC
“Our results tell us is that Mercury’s weak magnetosphere provides very little protection of the planet from the solar wind,” Zurbuchen said.
Jim Raines, FIPS operations engineer (University of Michigan) added, “We’re trying to understand how the sun, the grand-daddy of all that is life, interacts with the planets. It is Earth’s magnetosphere that keeps our atmosphere from being stripped away. And that makes it vital to the existence of life on our planet.”
A high-resolution monochrome image has been combined with a lower-resolution enhanced-color image. The hollows appear in cyan, a result of their high reflectance and bluish color relative to other parts of the planet. The large pit in the center of the crater may be a volcanic vent, from which the orange material erupted. Credit: Courtesy of Science/AAAS
The MESSENGER team also released other results from the mission, including new evidence that flood volcanism has been widespread on Mercury, the first close-up views of Mercury’s “hollows,” and the first direct measurements of the chemical composition of Mercury’s surface.
MESSENGER, as well the the Mariner 10 flyby mission saw unusual features on the floors and central mountain peaks of some impact craters which were very bright and have a blue color relative to other areas of Mercury. This type of feature is not seen on the Moon, and were nicknamed “hollows.”
Now, with the latest MESSENGER data, hollows have been found over a wide range of latitudes and longitudes, suggesting that they are fairly common across Mercury. Many of the depressions have bright interiors and halos.
“To the surprise of the science team, it turns out that the bright areas are composed of small, shallow, irregularly shaped depressions that are often found in clusters,” says David Blewett, a staff scientist at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., and lead author of one of the Science reports. “The science team adopted the term ‘hollows’ for these features to distinguish them from other types of pits seen on Mercury.”
Blewett added the hollows detected so far have a fresh appearance and have not accumulated small impact craters, indicating that they are relatively young.
Images of craters obtained by MDIS from orbit. Left: A simple, bowl-shaped crater 4.1 km in diameter crater located at 78.8ºN, 346.3ºE. Solar illumination is from the south. Right: A complex crater 51.5 km in diameter located at 2.3ºN, 121.4ºE. Illumination is from the east. Shadows cast on a crater interior can be used to estimate the depth of a crater floor below the surrounding rim.
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Getting to know a planet well is getting to know its surface features. Through measuring impact craters, planetary scientists are able to disclose information such as the origin and evolution of Mercury’s surface. We know it’s a matter of numbers, but just exactly how is it done when you can’t physically be there?
Size, shape and structure of craters is the common bond that most solar system bodies share. By understanding the physics of how they were made, researchers are able to draw conclusions through modeling. Their laboratory impact experiments and numerical simulations make judging crater qualities doable on a planetary scale. To further refine their results, it is then compared against known data for new, as well as eroded, craters. This information then gives us a clearer idea of surface properties, such as mineral deposits, soil composition, ice deposits, proportions and more. Checking out shapes and sizes on Mercury with observations obtained by the MESSENGER spacecraft are just the beginning.
Why is a Mercury crater investigation so important? Maybe because its surface gravitational acceleration (3.7 m/s2) is nearly identical to that at Mars. In this case, gravity plays an important role as the “transition diameter” is affected. According to the study, “Simple craters tend to be bowl shaped, whereas complex craters have terraced walls and can contain a central peak. If gravity were the dominant factor controlling the transition diameter, one would expect that this diameter would be similar on Mercury and Mars.” These transition diameters observed on Mercury are important because they give us clues to the Martian crust. Their differences could mean a weaker surface due to near-surface water ice.
An example complex crater on Mercury, ~ 55 km in diameter and centered near 63.5°N, -139ºE, that has been imaged by MDIS (left) and profiled by MLA (right). A slightly larger complex crater lies along the MLA profile to the south.
The Mercury Laser Altimeter (MLA) and the Mercury Dual Imaging System (MDIS) are hard at work providing the photo data needed to study cratering. We’re now able to get an inside look at central peaks, walls, floors and slopes. In addition, we’re getting a concise measurement of diameters. As with the Moon, researchers can make assessments as to depth by measuring the shadows. While MLA cannot always be used for these types of measurements, these fresh insights are furthering our understanding of crater properties – both on Mercury and across all holey bodies in our solar system.
Spectacular view of the Degas crater from MESSENGER in Mercury orbit. This high-resolution view of Degas crater was obtained as a targeted observation (90 m/pixel). Impact melt coats its floor, and as the melt cooled and shrank, it formed the cracks observed across the crater. For context, Mariner 10’s view of Degas is shown at left. Degas is 52 km in diameter and is centered at 37.1° N, 232.8° E. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
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NASA’s MESSENGER probe to Mercury, the scorched, innermost planet of our solar system, is sending back so much startling and revolutionary data and crystal clear images that the results are forcing scientists to toss out previously cherished theories and formulate new ones even as the results continues to pour in. And the mission has barely begun to explore Mercury’s inner secrets, exterior surface and atmospheric environment.
MESSENGER became the first spacecraft ever to orbit planet Mercury on March 18, 2011 and has just completed the first quarter of its planned one year long mission – that’s the equivalent of one Mercury year.
MESSENGER has collected a treasure trove of new data from the seven instruments onboard yielding a scientific bonanza; these include extensive global imagery, measurements of the planet’s surface chemical composition, topographic evidence for significant amounts of water ice, magnetic field and interactions with the solar wind, reported the science team at a press conference at NASA Headquarters.
Schematic illustration of the operation of MESSENGER's X-ray Spectrometer (XRS). When X-rays emitted from the Sun’s corona strike the planet, they can induce X-ray fluorescence from atoms at the surface. Detection of these fluorescent X-rays by the XRS allows determination of the surface chemical composition. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
“We are delighted to share the findings of the first 25% of our year long mission,” said MESSENGER principal investigator Sean Solomon of the Carnegie Institution of Washington at a press briefing for reporters. “We receive new data back almost every day.”
“MESSENGER has snapped over 20,000 images to date,” said Solomon, at up to 10 meters per pixel. The probe has also taken over two million laser-ranging topographic observations, discovered vast volcanic plains, measured the abundances of many key elements and confirmed that bursts of energetic particles in Mercury’s magnetosphere result from the interaction of the planets magnetic field with the solar wind.
“We are assembling a global overview of the nature and workings of Mercury for the first time.”
“We had many ideas about Mercury that were incomplete or ill-formed, from earlier flyby data,” explained Solomon. “Many of our older theories are being cast aside into the dust bin as new observations from new orbital data lead to new insights. Our primary mission has another three Mercury years to run, and we can expect more surprises as our solar system’s innermost planet reveals its long-held secrets.”
Magnetic field lines differ at Mercury's north and south poles As a result of the north-south asymmetry in Mercury's internal magnetic field, the geometry of magnetic field lines is different in Mercury's north and south polar regions. In particular, the magnetic "polar cap" where field lines are open to the interplanetary medium is much larger near the south pole. This geometry implies that the south polar region is much more exposed than in the north to charged particles heated and accelerated by solar wind–magnetosphere interactions. The impact of those charged particles onto Mercury's surface contributes both to the generation of the planet's tenuous atmosphere and to the "space weathering" of surface materials, both of which should have a north-south asymmetry given the different magnetic field configurations at the two poles. Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
NASA’s Mariner 10 was the only previous robotic probe to explore Mercury, during three flyby’s back in the mid-1970’s early in the space age.
MESSENGER was launched in 2004 and the mission goal is to produce the first global scientific observations of Mercury and piece together the puzzle of how Mercury fits in with the origin and evolution of our solar system.
There was very little prior imaging coverage of Mercury’s northern polar region.
“We’ve now filled in many of the gaps,” said Messenger scientist Brett Denevi of Johns Hopkins University’s Applied Physics Laboratory (APL). “We now see large smooth plains that are thought to be volcanic in origin.”
“Now we’re seeing for the first time their full extent, which is around 4 million square kilometers (1.54 million square miles). That’s about half the size of the continental United States.” MESSENGER is currently filling in coverage of Mercury’s north polar region, which was seen only partially during the Mariner 10 and MESSENGER flybys. Flyby images indicated that smooth plains were likely important in Mercury’s northernmost regions. MESSENGER's orbital images show that the plains are among the largest expanses of volcanic deposits on Mercury, with thicknesses of several kilometers in many places. The estimated extent of these plains is outlined in yellow. This mosaic is a combination of flyby and orbital coverage in a polar stereographic projection showing latitudes from 50° to 90° N. The longitude at the 6 o'clock position is 0°. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
“We see all kinds of evidence for volcanism and tectonic deformation of the plains from orbit where we can look straight down,” added Denevi. “In the new images we see ghost craters from pre-existing impact craters that were later covered over by lava.’
Color images of the whole planet – with a resolution of about 1 kilometer per pixel – tell the researchers about the chemical composition and rock types on Mercury’s surface.
“We don’t know the composition yet.”
“We are very excited to study these huge volcanic deposits near the north pole with the implications for the evolution of Mercury’s crust and how it formed,” said Denevi.
“Targeted new high resolution imaging is helping us see landforms unlike anything we’ve seen before on Mercury or the moon.”
MESSENGER’s orbital images have been overlaid on an image from the second flyby shown in Image 1.2a. Even for previously imaged portions of the surface, orbital observations reveal a new level of detail. This region is part of the extensive northern plains, and evidence for a volcanic origin can now be seen. Several examples of “ghost” craters, preexisting craters that were buried by the emplacement of the plains, are seen near the center of the mosaic. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Determining whether Mercury harbors caches of polar water ice is another one of the many questions the MESSENGER science team hopes to answer.
Two decades ago, Earth-based radar images showed deposits thought to consist of water ice near Mercury’s north and south poles. Researchers postulated a theory that these icy deposits are preserved on the cold, permanently shadowed floors of high-latitude impact craters, similar to those on Earth’s moon.
Early results from topographic measurements are promising.
“The very first scientific test of that hypothesis using Messenger data from orbit has passed with flying colors.”
“The area of possible polar water ice is quite a bit larger than on the moon,” said Solomon. “Its probably meters or more in depth based on radar measurements.”
“And we may have the irony that the planet closest to the sun may have more water ice at its poles than even our own moon.”
“Stay tuned. As this mission evolves, we will be relying on the geochemical and remote sensing instruments which take time to collect observations. The neutron and gamma ray spectrometers have the ability to tell us the identity of these icy materials,” said Solomon.
The same scene as that in Image 1.3a is shown after the application of a statistical method that highlights differences among the eight color filters, making variations in color and composition easier to discern. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of WashingtonThis topographic contour map was constructed from the several MLA profiles (lines of white circles) that pass through and near the crater circled in Image 3.4. The color scale at right is in km, and north is at the 4 o’clock position. Calculations show that the topography of the crater is consistent with the prediction that the southernmost portion of the crater floor is in permanent shadow. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of WashingtonA cross-section of Mercury’s magnetosphere (in the noon-midnight plane, i.e., the plane containing the planet-Sun line and Mercury’s spin axis) provides context for the energetic electron events observed to date with the MESSENGER XRS and GRS high-purity germanium (HpGe) detectors. The Sun is toward the right; dark yellow lines indicate representative magnetic field lines. Blue and green lines trace the regions along MESSENGER's orbit from April 2 to April 10 during which energetic electrons were detected and MESSENGER's orbit was within ± 5° of the noon-midnight plane. The presence of events on the dayside, their lack in the southern hemisphere, and their frequency of occurrence at middle northern latitudes over all longitudes point to a more complex picture of magnetospheric activity than found at Earth. Credit: NASA/The Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
It’s been just over two months since the MESSENGER spacecraft successfully entered orbit around Mercury, back on March 18, and it’s been enthusiastically returning image after image of our solar system’s innermost planet at a unprecedented rate. Which, of course, is just fine with us!
The image above shows Mercury’s southern hemisphere and the bright rays of the 50-km-wide crater Han Kan. It was acquired on May 17, 2011.
Below are more recent images from MESSENGER… some of which show regions and features that have never previously been mapped – or even named!
Unnamed double peak-ring basin. Acquired May 13.Detail of the mountains that make up the rim of Caloris Basin. Acquired May 5.Narrow-angle camera view of the 100-km-wide Atget crater. Acquired May 10.Color map of Mercury's surface. The bright crater is Snorri (21km wide). Acquired April 15.
MESSENGER’s orbit about Mercury is highly elliptical, taking it 200 kilometers (124 miles) above its northern surface at the closest pass and 15,193 kilometers (9,420 miles) away from the south pole at furthest. Check out this video showing an animation of how a typical MESSENGER orbit would be executed.
Image credits: Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington.
The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft’s seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System’s innermost planet. During the one-year primary mission, MDIS is scheduled to acquire more than 75,000 images in support of MESSENGER’s science goals.
Mercury Astronaut Scott Carpenter speaks in tribute to Alan B. Shepard, first American in Space. Carpenter spoke at the First-Day-of-Issue Stamp dedication ceremony at NASA’s Kennedy Space Center on May 4, 2011. Credit: Ken Kremer
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KENNEDY SPACE CENTER – 50 Years ago this week, Alan B. Shepard became the first American to be launched into space. Shepard blasted off on May 5, 1961 from Cape Canaveral, Florida. NASA and the US Postal Service honored Shepard’s historic achievement today (May 4) at an Official First-Day-of-Issue dedication ceremony at NASA’s Kennedy Space Center in Florida.
Alan Shepard was one of the seven Project Mercury astronauts – who will be collectively known for all eternity as – “The Original 7”.
The US Postal Service simultaneously released two new 44 cent Forever Stamps at today’s commemoration, which bookend two historic space achievements – Shepard’s inaugural manned spaceflight aboard the Mercury capsule and NASA’s unmanned MESSENGER mission which recently became the first probe from Earth to achieve orbit about the Planet Mercury.
Alan Shepard and MESSENGER First-Day-of-Issue Stamp dedication ceremony at NASA’s Kennedy Space Center on May 4, 2011. Alan Shepard is the only American astronaut to be honored with his image on a US postal stamp. Credit: Ken Kremer
Fellow Mercury Astronaut Scott Carpenter attended the ceremony and unveiled the stamps along with Steve Masse, United States Postal Service Vice President of Finance at the Rocket Garden at the KSC Visitor Complex.
Mercury Astronaut Scott Carpenter poses in front of a Mercury Atlas rocket at the Rocket Garden at KSC. Carpenter was propelled to space by the Atlas rocket as the 2nd American to orbit the Earth on May 24, 1962. Credit: Ken Kremer
“Today we celebrate the 50th anniversary of many, many important issues, among them is the first steps from the home planet that were taken by the family of man,” said Carpenter.
Although Shepards suborbital flight aboard the one man “Freedom 7” Mercury capsule lasted barely 15½ minutes, the flight ignited America’s Moon landing effort and propelled American Astronaut Neil Armstrong to become the first human to set foot on the moon on July 20, 1969 during the Apollo 11 mission – one of the crowning technological achievements of the 20th Century.
The success of “Freedom 7” emboldened President John F. Kennedy to declare that America “should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to the Earth,” just three weeks later on May 20.
“That was largely a response to Alan’s success,” Carpenter told the crowd of assembled officials, journalists and visitors. Also on hand for the stamp dedication was Shepard’s daughter Laura Shepard Churchly; Charles Bolden, NASA Administrator and former shuttle astronaut; Bob Cabana, KSC Director and former shuttle astronaut; and Jim Adams, NASA deputy director, Planetary Science.
“A decision was made not to put 44 cents on the stamp, but it is forever,” Carpenter emphasized. “It is appropriate to the time we should honor and remember Alan B Shepard and Freedom 7.”
Alan Shepard display at the Kennedy Space Center Visitor Complex. Credit: Ken Kremer
Shepard’s tiny capsule measured just six feet by six feet, reached a maximum speed of 5,100 MPH, roughly eight times the speed of sound, and a zenith of 116 miles above the Earth. Freedom 7 was bolted atop a Redstone rocket that generated only 78,000 pounds of thrust, followed a ballistic arc and landed 300 miles down range in the ocean.
“These stamps, which will go out by the millions across this country, are a testament to the thousands of NASA men and women who shared dreams of human spaceflight and enlarging our knowledge of the universe,” said Bolden.
Shepard’s flight and MESSENGER both blasted off from launch pads quite close to one another at Cape Canaveral Air Force Station which is adjacent to the Kennedy Space Center.
Mercury Astronaut Scott Carpenter is applauded at tribute to Alan B. Shepard, first American in Space ceremony at the Rocket Garden at KSC on May 4, 2011. Credit: Ken Kremer
On Thursday May 5, watch for my on site coverage of NASA’s special ceremony marking the 50th Anniversary of Shepard’s milestone “Freedom 7” mission – and an interview with Scott Carpenter.
Shepard’s mission came barely three weeks after Cosmonaut Yuri Gagarin became the first human to orbit the Earth. The bold flights of these brave Cosmonauts and Astronauts – backed by a few insightful political leaders – began the Era of Human Spaceflight. As the shuttle program winds to a close, the future of US Human Spaceflight is very uncertain.
Read my related articles about Yuri Gagarin and the 50th Anniversary of Human Spaceflight:
Postage stamps honoring Mercury astronaut Alan Shepard, America’s first man in space, and NASA’s MESSENGER probe, the first spacecraft to orbit Mercury, will be presented on May 4th at a public event taking place at the Aviation Heritage Park in Dayton, Ohio.
Alan Shepard poses in his pressure suit before his historic flight on May 5, 1961. Credit: NASA.
The first stamp salutes NASA’s Project Mercury, America’s first manned spaceflight program, and astronaut Alan B. Shepard, Jr.’s historic sub-orbital flight on May 5, 1961 aboard the spacecraft Freedom 7.
The other stamp highlights NASA’s MESSENGER spacecraft currently exploring the planet Mercury. It successfully established orbit around the planet on March 18, 2011, the first spacecraft ever to do so.
These two historic missions frame a remarkable fifty-year period in which the U.S. has advanced space exploration through more than 1,500 manned and unmanned flights.
Both stamps were designed by professional artist Donato Giancola of Brooklyn, NY, who based the stamp designs on NASA photos and images.
Both stamps will be issued as “Forever Stamps” for use in mailing a one-ounce letter. Regardless of when the stamps are purchased and no matter how postage prices may change, these stamps will always be equal to the current First-Class Mail one-ounce price.
NASA's Mercury-Redstone 3 rocket, with Alan Shepard inside the Freedom 7 capsule, launches from Cape Canaveral on May 5, 1961. Credit: NASA.
Stamps are now available online at the US Postal Service store here.
An unnamed crater on Mercury taken by MESSENGER's Narrow Angle Camera. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
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Buried treasure on Mercury? If so, I’d look here first. This image shows a currently unnamed crater with an “X” emblazoned on it. The perpendicular lines that cross the crater are secondary crater chains caused by ejecta from two primary impacts outside of the field of view, according to MESSENGER scientists. MESSENGER has been in orbit of Mercury since mid-March of this year, and its Mercury Dual Imaging System (MDIS) pivot and Narrow Angle Camera (NAC) spotted this unusual landform. MESSENGER will be mapping more than 90% of Mercury’s surface as part of a high-resolution surface morphology base map that will be created with MDIS.
