Beginner’s Guide to Seeing the International Space Station (ISS)

The International Space Station Credit: @VirtualAstro

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Most readers of Universe Today are familiar with the International Space Station or “ISS” as it’s often referred to. But just in case you are visiting our site for the first time, the ISS is a huge space station orbiting Earth that serves as an orbital laboratory, factory, testing ground and home; crew members conduct experiments from biology to astronomy, including experiments for prolonged exposure to life in space for future missions to the Moon and beyond.

The ISS is major accomplishment for NASA (US), ESA (Europe), JAXA (Japan) CSA (Canada) and all the countries involved (16 in all). The space station is just over 72 m long by 108 m wide and 20 m high; it is maintained at an orbital altitude of between 330 km (205 mi) and 410 km (255 mi) and travels at an average speed of 27,724 kilometres (17,227 mi) per hour, completing 15.7 orbits per day.

One of the best things about the ISS is that you can see it with your own eyes from Earth! It’s very easy to watch the International Space Station pass over your own backyard!

All you need to do is understand when the ISS is going to be passing over your location and where to look for it in the sky. You can check this by using an ISS pass predictor app or website such as Heavens-Above.

Once you have found out when the ISS will pass over your location, all you need to do a few minutes before the pass is go outside and start looking in the right direction of the sky.

The International Space Station always passes over starting from a westerly part of the sky, but not always from the same point. It can be low on the horizon for some passes and very high others. Most of the apps or websites will tell you what direction in the sky the pass will start and end and how many degrees above the horizon the starting and ending points are. Also included are the highest altitude the ISS will be. For example, if the maximum elevation is listed as somewhere between 74-90 degrees above the horizon, the ISS will be passing almost straight overhead (Just like you learned in geometry, 90 degrees would be straight up). If you aren’t sure about where to look, a good rule of thumb is that your fist outstretched at arm’s length is 10 degrees. If the ISS will be first be seen 40 degrees above the horizon, look four fist-lengths above the horizon. Check apps and websites for where and what track the ISS will take on each individual pass.

When the station passes over it will travel from a westerly direction, heading in an easterly direction. An average good pass can last about 5 minutes.

The ISS looks like an incredibly bright, fast-moving star and can be mistaken for an aircraft. However, the ISS has no flashing lights and it can be much brighter. It seemingly just glides across the sky.

Short passes can last a few seconds to a few minutes and you can see the international space station slowly move into the Earth’s shadow, good bright passes will show the ISS moving across the sky from horizon to horizon.

ISS long exposure photograph over Donnington Castle UK Credit: www.Perfexion.com

The International Space Station usually takes around 90 minutes to orbit our planet, so if you’re really lucky you can get two, or maybe even three or four passes in an evening or morning.

Not only can you see the ISS in the evening but you can also see it in the mornings as both the ISS and Sun are in the ideal position to illuminate the spacecraft at this time. The light we see from the ISS is reflected sunlight.

You can’t watch the ISS pass over during the middle of the day because in the daytime the sky is too bright (although some people with specialized equipment have seen it) and you cannot see the space station in the middle of the night, as it is in the Earth’s shadow and no light is being reflected from it.

The position that the ISS will be in the sky changes every night. The space station does not take the same track or orbital path for each orbit and this change provides good visible passes roughly every 6 weeks in each location on Earth.

Occasionally if a spacecraft such as a Soyuz crew capsule or a Progress resupply vehicle has been sent to the ISS, you will see objects preceding or trailing the station as it moves across the sky. These can either be very close to the station or the distance between the objects can be measured in minutes. To check if there are any other spacecraft with the international space station during a pass, use the pass prediction app, or the Heaven’s Above Site.

Seeing the ISS is an incredible sight! Just remember there are people on board that fast moving point of light!

Good luck!

ISS long exposure photograph Credit: Mark Humpage

NASA’s Picture of the Future of Human Spaceflight

NASA infographic on the future of human spaceflight. Credit: NASA. Click for larger pdf poster version.

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NASA released a new interactive infographic that attempts to give a picture of future of human spaceflight activities and where NASA might be going. The new Space Launch system and the Orion MPCV figure prominently in going to future destinations such as the Moon, Mars, Near Earth Asteroids and even LaGrange Points. It would be awesome to go to all those destinations, but – call me pessimistic — in reality, we’ll be lucky if we even get to one of them in the next 30 years. But since human spaceflight received favorable funding nods in the new NASA budget proposal, we can hopefully look forward to the first un-crewed test flight of the MPCV in 2013 or 2014.

In the interactive feature you can learn about the SLS and MPCV, along with spacesuits, deep space habitation and communications and more. Additionally, there are interviews with astronauts Sandy Magnus, Harrison Schmitt, and Tom Jones, along with NASA officials Doug Cooke and Waleed Abdalati.

As far as the various destinations, Schmitt says we should return to the Moon as the Apollo missions “barely scratched the surface,” and “the Moon is a history book of what went on in near Earth space and of what went on in the early solar system. The real geoscience value of the Moon is to learn about ourselves.”

Jones says asteroids will also provide scientific information about the early days of the solar system, as well as providing information about space resources such as water. We can also learn about how to protect our planet. “These objects will run into us in the future, as they have done in the past. For us to survive in the long run we’re going to have to learn to operate around and prevent a future collision by applying our space technology to the alteration to the orbits of some of these hazardous objects.”

Journalist Leonard David wrote an article this week about a recent NASA memo that talks about the potential for NASA building a waystation at one of the Earth-Moon libration points. Also, a working group of International Space Station members is being held in Paris this week, and David says this strategy is likely being discussed with international partners. It certainly sounds exciting, but may be perhaps the most expensive destination, as every resource would have to be brought there to build a station, instead of landing on a destination like the Moon or an asteroid and using the potential resources there.

Can NASA be successful in the “multiple path” plan or will they ultimately need to pick just one?

NASA Shuts Down Its Last Mainframe Computer

Sittra Battle of the Marshall Space Flight Center shuts down NASA's last mainframe computer. Credit: NASA

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NASA has just powered down its last mainframe computer. Umm, everyone remembers what a mainframe computer is, right? Well, you certainly must recall working with punched cards, paper tape, and/or magnetic tape, correct? That does sound a little archaic. “But all things must change,” wrote Linda Cureton on the NASA CIO blog. “Today, they are the size of a refrigerator but in the old days, they were the size of Cape Cod.”


The last mainframe being used by NASA, the IBM Z9 Mainframe, was being used at the Marshall Space Flight Center. Cureton described the mainframe as a “ big computer that is known for being reliable, highly available, secure, and powerful. They are best suited for applications that are more transaction oriented and require a lot of input/output – that is, writing or reading from data storage devices.”

An IBM 704 mainframe from 1964. Via Wikipedia

In the 1960’s users gained access to the huge mainframe computer through specialized terminals using the punched cards. By the 1980s, many mainframes supported graphical terminals where people could work, but not graphical user interfaces. This format of end-user computing became obsolete in the 1990s when personal computers came to the forefront of computing.

Most modern mainframes are not quite so huge, and excel at redundancy and reliability. These machines can run for long periods of time without interruption. Cureton says that even though NASA has shut down its last one, there is still a requirement for mainframe capability in many other organizations. “The end-user interfaces are clunky and somewhat inflexible, but the need remains for extremely reliable, secure transaction oriented business applications,” she said.

But today, all you need to say is, “there’s an app for it!” Cureton said.

Starbursts May Actually Destroy Globular Clusters

The Galactic globular cluster M80 in the constellation Scorpius contains several hundred thousand stars. Credit: HST/NASA/ESA

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It seems logical to assume that long ago, the amount of globular clusters increased in our galaxy during star-making frenzies called ‘starbursts.’ But a new computer simulation shows just the opposite: 13 billion years ago, starbursts may have actually destroyed many of the globular clusters that they helped to create.

“It is ironic to see that starbursts may produce many young stellar clusters, but at the same time also destroy the majority of them,” said Dr. Diederik Kruijssen of the Max Planck Institute for Astrophysics. “This occurs not only in galaxy collisions, but should be expected in any starburst environment”

Astronomers have wondered why throughout the Universe, typical globular star clusters contain about the same number of stars. In contrast much younger stellar clusters can contain almost any number of stars, from fewer than 100 to many thousands.

The new computer simulation by Kruijssen and his team proposes that this difference could be explained by the conditions under which globular clusters formed early on in the evolution of their host galaxies.

In the early Universe, starbursts were common. Large galaxies were in clusters, and collisions occurred often. The computer simulation showed that during starbursts, gas, dust and stars were still being sloshed around from the galaxy collision, with the pull of gravity on the globular clusters constantly changing. This was enough to rip apart most of the globular clusters and only the biggest ones were strong enough to survive. The simulations showed most of the star clusters were destroyed shortly after their formation, when the galactic environment was still very hostile to the young clusters. But after the environment calmed down, the surviving globular clusters have survived – now living quietly – and we can still enjoy their beauty.

In their paper, the astronomers say that this explains why the number of stars contained within globular clusters is roughly the same across the entire Universe. “It therefore makes perfect sense that all globular clusters have approximately the same large number of stars,” said Kruijssen. “Their smaller brothers and sisters that didn’t contain as many stars were doomed to be destroyed.”

Kruijssen and his team said that while the very brightest and largest clusters were capable of surviving the galaxy collision due to their own gravitational attraction, numerous smaller clusters were effectively destroyed by the rapidly changing gravitational forces.

The fact that globular clusters are comparable everywhere then indicates that the environments in which they formed were very similar, regardless of the galaxy they currently reside in. Kruijssen and his team says globular clusters can therefore be used to shed more light on how the first generations of stars and galaxies were born.

“In the nearby Universe, there are several examples of galaxies that have recently undergone large bursts of star formation,” said Kruijssen. “It should therefore be possible to see the rapid destruction of small stellar clusters in action. If this is indeed found by new observations, it will confirm our theory for the origin of globular clusters.”

This new finding may also tie in with other recent findings from Spitzer and ESO that starburst activity may have only lasted around 100 million years and may have also been cut short when black holes formed at the center of galaxies.

Source: Max-Planck Institute for Astrophysics. Paper: Kruijssen et al, “Formation versus destruction: the evolution of the star cluster population in galaxy mergers”

With Love from Universe Today

This image from the Mars Global Surveyor shows a heart-shaped crate amid other 'box of chocolates' shapes. Credit: Malin Space Science Systems

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Here’s an image from the Mars Global Surveyor that looks like a box of chocolates, with different shaped landforms, including a heart-shaped one. We’d like to take this opportunity on Valentine’s Day to express our love and appreciation to our readers, for allowing us to share the latest in space and astronomy news with you. And it’s true, you never know what you’re going to get; what news story is going to break or what amazing images we’ll share. But our heartfelt thanks for your readership, your comments, and for your regular visits to our website.

You can see the full image MGS Mars image here — which also includes some other heart-shaped craters and other unique landforms — and below is a rose-shaped pair of interacting galaxies, just for you.


A pair of interacting galaxies called Arp 273. The larger of the spiral galaxies, known as UGC 1810, has a disk that is distorted into a rose-like shape by the gravitational tidal pull of the companion galaxy below it, known as UGC 1813. This image is a composite of Hubble Wide Field Camera 3 data taken on December 17, 2010, with three separate filters that allow a broad range of wavelengths covering the ultraviolet, blue, and red portions of the spectrum. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

Kuiper’s Color Close-Up

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The pale-orange coloration around the 39-mile (62-km) -wide Kuiper crater on Mercury is evident in this image, a color composition made from targeted images acquired by NASA’s MESSENGER spacecraft on September 2, 2011.

The color may be due to compositional differences in the material that was ejected during the impact that formed the crater.

Kuiper crater is named after Gerard Kuiper, a Dutch-American astronomer who was a member of the Mariner 10 team. He is regarded by many as the father of modern planetary science.

“Kuiper studied the planets… at a time when they were scarcely of interest to other astronomers. But with new telescopes and instrumentation, he showed that there were great things to discover, which is as true today as it was then.”

– Dr. Bill McKinnon, Professor of Planetary Sciences at Washington University in St. Louis

Airless worlds like Mercury are constantly bombarded with micrometeoroids and charged solar particles in an effect known as “space weathering”. Craters with bright rays — like Kuiper — are thought to be relatively young because they have had less exposure to space weathering than craters without such rays.

See the original image release on the MESSENGER site here.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Space Timelapse: Temporal Distortion by Randy Halverson

Randy Halverson has released a new timelapse video of the night sky shot at the White River in central South Dakota during September and October 2011. There are also some shots from Arches National Park in Utah, and Canyon of the Ancients area of Colorado during June 2011.

And if you’re really interested in Randy’s timelapse videos, you can purchase an extended cut version here.

A Swirling Oasis of Life

A 150-km (93-mile) - wide eddy in the southern Indian Ocean. (NASA/Terra-MODIS)

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A serpentine eddy swirls in the southern Indian Ocean several hundred kilometers off the coast of South Africa in this natural-color image, acquired by NASA’s Terra satellite on December 26, 2011.

The blue color is created by blooms of phytoplankton, fertilized by the nutrient-rich deep water drawn up by the 150-km-wide eddy.

The counter-clockwise anticyclonic structure of the eddy may resemble a hurricane or typhoon, but unlike those violent storms eddies bring nourishment rather than destruction.

“Eddies are the internal weather of the sea,” said Dennis McGillicuddy, an oceanographer at the Woods Hole Oceanographic Institution in Massachusetts.

And also unlike atmospheric storms, ocean eddies can last for months, even up to a year. The largest ones can contain up to 1,200 cubic miles (5,000 cubic kilometers) of water.

The nutrient-drawing power of eddies can supply the relatively barren waters of the open ocean with nutrients, creating “oases in the oceanic desert,” according to McGillicuddy.

Read more about the WHOI study of eddies here.

The eddy imaged here likely peeled off from the Agulhas Current, which flows along the southeastern coast of Africa and around the tip of South Africa. Agulhas eddies tend to be among the largest in the world.

The image below shows the eddy in context with the surrounding area:

Eddy off the coast of South Africa. December 26, 2011. (NASA/Terra-MODIS)

MODIS (or Moderate Resolution Imaging Spectroradiometer) is a key instrument aboard NASA’s Terra (EOS AM) satellite. Terra MODIS views the entire Earth’s surface every 1 to 2 days, acquiring data in 36 spectral bands. These data improve our understanding of global dynamics and processes occurring on the land, in the ocean, and in the lower atmosphere.

Read more on NASA’s Earth Observatory site here.

NASA Earth Observatory image created by Jesse Allen, using data obtained from the Land Atmosphere Near real-time Capability for EOS (LANCE).

Tough Cuts for Planetary Science In NASA’s 2013 Budget Proposal

The cover of NASA's 2013 Budget Propsal

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As expected, NASA’s 2013 budget request calls for an overall decrease in funding, with especially tough cuts to planetary science and education. The budget proposal of $17.7 billion is a decrease of 0.3% or $59 million from the 2012 budget and puts NASA at its lowest level of funding in four years. President Obama’s budget request for NASA includes a flat budget through 2017, with no out-year growth even for inflation.

Using the phrase “very difficult fiscal times” countless times, NASA Administrator Charles Bolden tried to put an upbeat spin on the bad news during a press conference on the budget on February 13.

“We are having to make tough decisions because these are very difficult fiscal times,” he said. “However this is a stable budget that allows us to support a diverse portfolio and continues the work we started last year.”

Overview of NASA's budget request.

While the proposal includes continued funding for the agency’s human space programs —including $4 billion for space operations and $4 billion for human activities for the International Space Station, nearly $3 billion for the heavy-lift Space Launch System and Orion MPCV, along with $830 million for the commercial crew and cargo — planetary science took a huge hit, especially the Mars science program, considered by many to be the “crown jewel” of NASA’s planetary program.

Mars exploration would be cut by a whopping 38.5 percent, going from $587 million this year to $361 million in 2013. As predicted NASA has pulled out of the Exo-Mars collaboration with the European Space Agency, for dual Mars missions in 2016 and 2018, with no future flagship missions even in the offing, beyond the $2.5 billion Mars Science Laboratory rover, now on its way to Mars.

“Flagship missions are essential for the nation,” said Bolden when asked about what could be expected for future missions, “but we just could not afford to do another one right now given the budget an these difficult fiscal times.”

The Science Mission Directorate budget, which includes planetary exploration, astronomy and Earth environment monitoring, would receive $4.911 billion in 2013 instead of the $5.07 billion it received in 2012.

The NASA education budget was cut $36 million, down from $136 million in 2012 to $100 million in 2013.

The only bright spot for potential future planetary missions is that a small amount of funding was included in the 2013 budget to look into the re-start of making Plutonium-238, the power source for outer-planet missions. However, the cut to exploration missions means there is no funding for any new missions to potentially use the power source, such as a spacecraft to study the moons of Jupiter or a Uranus orbiter, two projects that were a high priority in the Decadal Survey released by the science community in 2011. The reduction might also affect ongoing missions such as the remaining Mars Exploration Rover, Opportunity, the Mars Reconnaissance Orbiter, and the Cassini spacecraft orbiting Saturn. Those missions will be reviewed by NASA later this year.

This cut to planetary science has already been decried by many including the Planetary Society, which said the new proposal pushes planetary science “to the brink.”

“The priorities reflected in this budget would take us down the wrong path,” said Bill Nye, CEO of the Planetary Society. “Science is the part of NASA that’s actually conducting interesting and scientifically important missions. Spacecraft sent to Mars, Saturn, Mercury, the Moon, comets, and asteroids have been making incredible discoveries, with more to come from recent launches to Jupiter, the Moon, and Mars. The country needs more of these robotic space exploration missions, not less.”

The James Webb telescope, notorious for its cost overruns and delays, would get $627.6 million for 2013, up from $518.6 million in 2012 and $476.8 million in 2011. Many see JWST as responsible for draining money away from planetary science. JWST won’t launch until 2018 at the earliest.

Bolden said since NASA “replanned” JWST, they receive an accounting each month and so far the mission has been on-budget and on-time as far as meeting goals. “Through diligence and really paying attention to the budget and timeline, I think we can get this mission done,” Bolden said.

Two other bright spots in the budget was that funding for Earth observation satellites would be the same as 2012, at about $1.8 billion and the Space Technology program would get $699 million, up from the $569 million Congress approved for 2012.

As far as the human side, most officials were pleased with the numbers. The commercial Space Federation put out a statement saying that the “Commercial Crew program will enable American providers to free us from dependence on the Russian Soyuz for access to the International Space Station, a facility that American taxpayers have invested nearly $100 billion to build. NASA currently pays Russia more than $60 million per seat to access the Space Station, a price that is expected to rise above $70 million in the next few years.”

Executive Director Alex Saltman added, “With the Shuttle fleet retiring last year, Americans look forward to the day when we return our astronauts to space on American rockets. We are pleased that the Administration is requesting the funding necessary to make that happen. Now it’s Congress’s job to help put America back in space.”

As bad as the budget seems, according to some sources, things could have been much worse. The White House Office of Management and Budget had earlier asked NASA to submitted budget proposals at a 5, 10 or 15 percent cut. They may have been lucky to get only a .3% cut.

Here’s NASA’s upbeat video about the new budget:

For more information:
NASAs 2013 Budget webpage
NASA 2013 Budget Request Estimates(pdf)
2013 Budget Presentation (pdf)

‘Stealth Merger’ of Dwarf Galaxies Seen in New Images

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Space may be vast, but accidents can still happen, like when galaxies “collide,” usually resulting in the smaller one having its stars scattered by the larger one. New high-resolution images of two dwarf galaxies merging together have now been obtained by astronomers, providing a more detailed look at something which could only barely be seen before. While the larger galaxy of the two, NGC 4449, is easily visible, its smaller companion was little more than just a faint smudge until now.

The new study comes from an international team of astronomers led by David Martínez-Delgado of the Max Planck Institute for Astronomy in Heidelberg. Their paper will be published in an upcoming issue of Astrophysical Journal Letters.

When the galaxies collide, the smaller one essentially gets torn apart by the larger one. As explained by Aaron Romanowsky, an astronomer at the University of California, Santa Cruz (UCSC), “This is how galaxies grow. You can see the smaller galaxy coming in and getting shredded, eventually leaving its stars scattered through the halo of the host galaxy.”

The remains of the smaller galaxy appear as a dense stream of stars in the outer regions of the larger one. It was initially seen as just a faint smudge in digitized photographic plates from the Digitized Sky Survey project. Because this smaller galaxy, or what’s left of it, is so difficult to see, the merging process has been referred to as a “stealth merger.”

The new images, taken by the Black Bird Observatory and Subaru Telescope, show the merger in such detail that individual stars can be seen. “I don’t think I’d ever seen a picture of a galaxy merger where you can see the individual stars. It’s really an impressive image,” said Romanowsky.

NGC 4449 is about 12.5 million light-years from Earth and is part of a group of galaxies found in the constellation Canes Venatici. It is similar to one of our own Milky Way’s satellite galaxies, the Large Magellanic Cloud.

While larger galaxies merging with other large galaxies are commonly seen, it has been more difficult to find examples of smaller galaxies doing the same thing. Romanowsky continues: “We should see the same things at smaller scales, with small galaxies eating smaller ones and so on. Now we have this beautiful image of a dwarf galaxy consuming a smaller dwarf.”

In addition, the companion galaxy was also independently discovered by astronomers at the University of California, Los Angeles (UCLA). Their own paper will be published in the February 9, 2012  issue of Nature.

The paper is available here. See also the Subaru Telescope press release here.