The iPad app features seven apps in one, all of which are linked 3D environments to explore: Subatomic, Atomic, Local Stars, Solar System, Milky Way, Galaxy and the Universe.
If you’ve seen the excellent BBC/Science Channel series “Wonders of the Universe,” you know that host Brian Cox’s natural enthusiasm for astronomy is nothing short of infectious. His explanations of far-out concepts bring the mysteries of our Universe down to Earth for everyone to understand… and now he and HarperCollins UK have brought them even closer — right to your iPad.
Now, here on Universe Today you can win a free copy of the app as well as a signed copy of his Wonders of the Universe or Wonders of the Solar System hardcover book!
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Brian Cox’s Wonders of the Universe is designed for people with any level of understanding of astronomy, from casual explorers interested in the aesthetics to those looking for a deeper educational experience. Users can travel with Professor Brian Cox on his personal tours through the Universe, or jet off on a solo voyage of discovery through the planets of the Solar System to local stars and onwards through the galaxy.
Additionally, the app takes full advantage of the extensive capabilities of the new iPad, using a powerful 3D engine capable of handling high-resolution textures and complex animations created exclusively for iOS5.
Watch a personal tour of the app given by Prof. Brian Cox above.
Brian Cox’s Wonders of the Universe is available on the iTunes store now for an introductory price of $6.99 USD… or you can enter for a chance to win a freedownload along with a signed copy of a Wonders of the Universe or Wonders of the Solar System hardcover book (four of each are available!) by emailing [email protected] with subject line “Wonders App”.
Be sure to put your mailing address in the body of the email, and we will randomly select 8 winners to receive a signed book (our discretion) and a download code for the app.
The contest is open to all U.S. residents. One winner per mailing address. Please allow 2-3 weeks for delivery of the books. Winners will be chosen by June 10, 2012.
These are beautiful books that are chock full of information about our Universe as well as signed by Brian Cox himself… don’t miss out on a chance to get one!
Wonders of the Universe and Wonders of the Solar System books (HarperCollins UK)
Also, be sure to check out the latest app from HarperCollins UK, Fragile Earth. It uses amazing satellite imagery from all across the planet to put a century of climate change at your fingertips. It’s currently available from the iTunes store for $2.99 USD.
(App downloads and books provided courtesy of HarperCollins UK and Walker Sands Communications.)
False-color image of galaxy LAEJ095950.99+021219.1 (Credit: James Rhoads/ASU)
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Astronomers from Arizona State University have grabbed an image of a dim, distant galaxy, seeing it as it looked only 800 million years after the birth of the Universe. Visible above as a green blob in the center of a false-color image acquired with the Magellan Telescopes at the Las Campanas Observatory in Chile, the galaxy is seen in its infancy and, at 13 billion light-years away, is one of the ten most distant objects ever discovered.
The galaxy, designated LAEJ095950.99+021219.1, was detected by light emitted by ionized hydrogen using the Magellan Telescopes’ IMACS (Inamori-Magellan Areal Camera & Spectrograph) instrument, built at the Carnegie Institute in Washington. In order to even find such a remote object — whose existence had already been suspected — the team had to use a special narrow-band filter on the IMACS instrument designed to isolate specific wavelengths of light.
“Young galaxies must be observed at infrared wavelengths and this is not easy to do using ground-based telescopes, since the Earth’s atmosphere itself glows and large detectors are hard to make,” said team leader Sangeeta Malhotra, an associate professor at ASU who helped develop the technique.
“As time goes by, these small blobs which are forming stars, they’ll dance around each other, merge with each other and form bigger and bigger galaxies. Somewhere halfway through the age of the universe they start looking like the galaxies we see today – and not before.”
– Sangeeta Malhotra, ASU professor
LAEJ095950.99+021219.1 is seen at a redshift of 7, putting it farther away than any other objects previously discovered using the narrow-band technique.
“We have used this search to find hundreds of objects at somewhat smaller distances. We have found several hundred galaxies at redshift 4.5, several at redshift 6.5, and now at redshift 7 we have found one,” said James Rhoads, associate professor at ASU and research team leader.
“This image is like a baby picture of this galaxy, taken when the universe was only 5 percent of its current age. Studying these very early galaxies is important because it helps us understand how galaxies form and grow.”
So why does LAEJ095950.99+021219.1 not look much like the galaxies we’re used to seeing in images?
Malhotra explains: “Somewhere halfway through the age of the universe they start looking like the galaxies we see today – and not before. Why, how, when, where that happens is a fairly active area of research.”
Artist's concept of a free-floating Jupiter-like planet. (NASA / JPL-Caltech)
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The concept of nomad planets has been featured before here on Universe Today, and for good reason. Not only is the idea of mysterious lone planets drifting sunless through interstellar space an intriguing one, but also the sheer potential quantity of such worlds is simply staggering. If some very well-respected scientists’ calculations are correct there are more nomad planets in our Milky Way galaxy than there are stars — a lot more. With estimates up to 100,000 nomad planets for every star in the galaxy, there could be literally quadrillions of wandering worlds out there, ranging in size from Pluto-sized to even larger than Jupiter.
That’s a lot of nomads. But where did they all come from?
Recently, The Kavli Foundation had a discussion with several scientists involved in nomad planet research. Roger D. Blandford, Director of the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) at Stanford University, Dimitar D. Sasselov, Professor of Astronomy at Harvard University and Louis E. Strigari, Research Associate at KIPAC and the SLAC National Accelerator Laboratory talked about their findings and what sort of worlds these nomad planets might be, as well as how they may have formed.
One potential source for nomad planets is forceful ejection from solar systems.
“Most stars form in clusters, and around many stars there are protoplanetary disks of gas and dust in which planets form and then potentially get ejected in various ways,” said Strigari. “If these early-forming solar systems have a large number of planets down to the mass of Pluto, you can imagine that exchanges could be frequent.”
And the possibility of planetary formation outside of stellar disks is not entirely ruled out by the researchers — although they do impose a lower limit to the size of such worlds.
“Theoretical calculations say that probably the lowest-mass nomad planet that can form by that process is something around the mass of Jupiter,” said Strigari. “So we don’t expect that planets smaller than that are going to form independent of a developing solar system.”
“This is the big mystery that surrounds this new paper. How do these smaller nomad planets form?” Sasselov added.
Of course, without a sun of their own to supply heat and energy one might assume such worlds would be cold and inhospitable to life. But, as the researchers point out, that may not always be the case. A nomad planet’s internal heat could supply the necessary energy to fuel the emergence of life… or at least keep it going.
“If you imagine the Earth as it is today becoming a nomad planet… life on Earth is not going to cease,” said Sasselov. “That we know. It’s not even speculation at this point. …scientists already have identified a large number of microbes and even two types of nematodes that survive entirely on the heat that comes from inside the Earth.”
Researcher Roger Blandford also suggested that “small nomad planets could retain very dense, high-pressure ‘blankets’ around them. These could conceivably include molecular hydrogen atmospheres or possibly surface ice that would trap a lot of heat. They might be able to keep water liquid, which would be conducive to creating or sustaining life.”
And so with all these potentially life-sustaining planets knocking about the galaxy, is it possible that they could have helped transport organisms from one solar system to another? It’s a concept called panspermia, and it’s been around since at least the 5th century BCE when the Greek philosopher Anaxagoras first wrote about it. (We’ve written about it too, as recently as three weeks ago, and it’s still a much-debated topic.)
“In the 20th century, many eminent scientists have entertained the speculation that life propagated either in a directed, random or malicious way throughout the galaxy,” said Blandford. “One thing that I think modern astronomy might add to that is clear evidence that many galaxies collide and spray material out into intergalactic space. So life can propagate between galaxies too, in principle.
There could be quadrillions of nomad planets in our galaxy alone -- and they could even be ejected into intergalactic space. (Image: ESO/S.Brunier)
“And so it’s a very old speculation, but it’s a perfectly reasonable idea and one that is becoming more accessible to scientific investigation.”
Nomad planets may not even be limited to the confines of the Milky Way. Given enough of a push, they could be sent out of the galaxy entirely.
“Just a stellar or black hole encounter within the galaxy can, in principle, give a planet the escape velocity it needs to be ejected from the galaxy. If you look at galaxies at large, collisions between them leads a lot of material being cast out into intergalactic space,” Blandford said.
The discussion is a fascinating one and can be found in its entirety on The Kavli Foundation’s site here, and watch a recorded interview between Louis Strigari and journalist Bruce Lieberman here.
The Kavli Foundation, based in Oxnard, California, is dedicated to the goals of advancing science for the benefit of humanity and promoting increased public understanding and support for scientists and their work.
SKA dishes by night. Credit: SPDO/TDP/DRAO/Swinburne Astronomy Productions.
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In an anticipated great compromise, South Africa and Australia will share their sites for the Square Kilometre Array telescope, the world’s largest and most sensitive radio telescope. Both sites were competing to win the $2 billion contract for the SKA, which is hoped shed light on how the Universe began, why it is expanding and whether there is any other life beyond our planet.
“We have decided on a dual site approach,” said SKA board chairman John Womersley, following a meeting of the SKA organisation’s members. “This position was reached after very careful consideration of information gathered from extensive investigations at both candidate sites.”
An SKA press release said the majority of the members were in favor of a dual-site implementation model for SKA. The members noted the report from the SKA Site Advisory Committee that both sites were well suited to hosting the SKA and that the report provided justification for the relative advantages and disadvantages of both locations, but that they identified Southern Africa as the preferred site. The members also received advice from the working group set up to look at dual site options.
Therefore, the majority of SKA dishes in Phase 1 will be built in South Africa, combined with MeerKAT, a seven-dish prototype interferometer array built by South Africa, where 190 dishes will be added. 60 dishes will be added to the Australian Square Kilometre Array Pathfinder (ASKAP) array in Australia, as well as a large number of omni-directional dipole antennas. This will give the Australian site a wide-field survey capability, whereas South Africa will be able to look deeply into a narrow part of the sky.
Three antenna types, high frequency dishes and mid and low frequency aperture arrays, will be used by the SKA to provide continuous frequency coverage from 70 MHz to 10 GHz. Combining the signals from all the antennas will create a telescope with a collecting area equivalent to a dish with an area of about one square kilometer.
All the dishes and the mid frequency aperture arrays for Phase II of the SKA will be built in Southern Africa while the low frequency aperture array antennas for Phase I and II will be built in Australia.
“It’s a distinct possibility that we’ll discover a new type of astronomical object,” CSIRO SKA Director Brian Boyle told Universe Today in interview earlier this year. “History has shown that every time we’ve gone to a new astronomical wavelength domain, we pick up new objects.” An example of that is the discovery of pulsars in radio
At the lowest frequencies, the SKA will be looking for red-shifted hydrogen, looking at the very earliest events of our Universe. At highest frequencies will look for things like pulsars or even pre-biotic molecules in space. The array will also be very effective in looking for transient events like supernovae or gamma ray bursts.
“The placement of the array will give it a phenomenally wide field of view, between 30 and 100 square degrees,” Boyle said. “It is hoped to provide the first all-sky survey at phenomenal depths at these wavelengths, which can then be compared with other all-sky surveys done at optical wavelengths.”
One downside of splitting the frequencies between the two sites is that some of the science may suffer. One of the original science requirements of the SKA was to look at the same piece of the sky at the same time in different frequencies. Boyle said there is not much common sky between the two locations.
Another is cost for having redundant computing and networking capabilities, not cheap for the remote areas where both sites are located.
But the dual-site approach solves political issues, and the SKA press release says the arrangement “will deliver more science and will maximize on investments already made by both Australia and South Africa.”
Womersley said that in this approach “Science is the winner,” and by building on existing pilot projects in both countries, the SKA will be made even more powerful.
Additionally, technology is sure to get a boost, as the SKA project will drive technology development in antennas, data transport, software and computing, and power.
Additionally, the SKA members say the influence of the SKA project extends beyond radio astronomy.
“The design, construction and operation of the SKA have the potential to impact skills development, employment and economic growth in science, engineering and associated industries, not only in the host countries but in all partner countries,” said their press release.
The Milky Way an moonrise over ESO's Paranal observatory (ESO/H.H. Heyer)
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Recent reports of dark matter’s demise may be greatly exaggerated, according to a new paper from researchers at the Institute for Advanced Study.
Astronomers with the European Southern Observatory announced in April a surprising lack of dark matter in the galaxy within the vicinity of our solar system.
The ESO team, led by Christian Moni Bidin of the Universidad de Concepción in Chile, mapped over 400 stars near our Sun, spanning a region approximately 13,000 light-years in radius. Their report identified a quantity of material that matched what could be directly observed: stars, gas, and dust… but no dark matter.
“Our calculations show that it should have shown up very clearly in our measurements,” Bidin had stated, “but it was just not there!”
But other scientists were not so sure about some assumptions the ESO team had based their calculations upon.
Researchers Jo Bovy and Scott Tremaine from the Institute for Advanced Study in Princeton, NJ, have submitted a paper claiming that the results reported by Moni Biden et al are “incorrect”, and based on an “invalid assumption” of the motions of stars within — and above — the plane of the galaxy.
“The main error is that they assume that the mean azimuthal (or rotational) velocity of their tracer population is independent of Galactocentric cylindrical radius at all heights,” Bovy and Tremaine state in their paper. “This assumption is not supported by the data, which instead imply only that the circular speed is independent of radius in the mid-plane.”
The researchers point out the stars within the local neighborhood move slower than the average velocity assumed by the ESO team, in a behavior called asymmetric drift. This lag varies with a cluster’s position within the galaxy, but, according to Bovy and Tremaine, “this variation cannot be measured for the sample [used by Moni Biden’s team] as the data do not span a large enough range.”
When the IAS researchers took Moni Biden’s observations but replaced the ESO team’s “invalid” assumptions on star movement within and above the galactic plane with their own “data-driven” ones, the dark matter reappeared.
Artist's impression of dark matter surrounding the Milky Way. (ESO/L. Calçada)
“Our analysis shows that the locally measured density of dark matter is consistent with that extrapolated from halo models constrained at Galactocentric distances,” Bovy and Tremaine report.
As such, the dark matter that was thought to be there, is there. (According to the math, that is.)
And, the two researchers add, it’s not only there but it’s there in denser amounts than average — at least in the area around our Sun.
“The halo density at the Sun, which is the relevant quantity for direct dark matter detection experiments, is likely to be larger because of gravitational focusing by the disk,” Bovy and Tremaine note.
When they factored in their data-driven calculations on stellar velocities and the movement of the halo of non-baryonic material that is thought to envelop the Milky Way, they found that “the dark matter density in the mid-plane is enhanced… by about 20%.”
So rather than a “serious blow” to the existence of dark matter, the findings by Bovy and Tremaine — as well as Moni Biden and his team — may have not only found dark matter, but given us 20% more!
(Tip of the non-baryonic hat to Christopher Savage, post-doctorate researcher at the Oskar Klein Centre for Cosmoparticle Physics at Stockholm University for the heads up on the paper.)
The VLT's laser beam creates a "false star" for adaptive optics calibration. (ESO/Y. Beletsky)
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Located high in the mountains of Chile’s Atacama Desert, the enormous telescopes of the European Southern Observatory have been providing astronomers with unprecedented views of the night sky for 50 years. ESO’s suite of telescopes take advantage of the cold, clear air over the Atacama, which is one of the driest places on Earth. But as clear as it is, there is still some turbulence and variations to contend with — especially when peering billions of light-years out into the Universe.
So how do they do it?
Thanks to adaptive optics and advanced laser calibration, ESO can negate the effects of atmospheric turbulence, bringing the distant Universe into focus. It’s an impressive orchestration of innovation and engineering and the ESO team has put together a video to show us how it’s done.
We all love the images (and the science) so here’s a look behind the scenes!
Globular clusters are my absolute favorite telescope targets. Okay, Saturn, and then globular clusters. And that’s why I’ve absolutely fallen in love with this amazing picture from the European Southern Observatory of the globular cluster M55, located in the constellation Sagittarius. In fact, it’s my new desktop wallpaper (it should be yours too, click here and download the screensize that fits your monitor)
Globular clusters contain vast numbers of stars clumped together in a tight area. In the case of M55, there are about 100,000 stars grouped up within a sphere only 100 light-years across. Astronomers know that globular clusters are old, almost as old as the Universe itself. In fact, for the longest time, astronomers calculated the age of globular clusters to be older than the estimated age of the Universe. Of course, there was an incorrect measurement there, and astronomers eventually aligned the age of globular clusters and the Universe.
M55 is thought to have formed 12.3 billion years ago, when the Universe was less than 3 billion years old. The most ancient stars in the cluster burned out a long time ago, detonating as supernovae. We’re now left with the cooler, lower mass stars, which slowly wink out one-by-one becoming white dwarfs as they proceed through the full stellar life cycle. Our own Sun is only halfway through its own lifespan, before it runs out of hydrogen fuel and becomes a white dwarf.
There are at least 160 globular clusters scattered across the Milky Way, grouped up more towards our galaxy’s core. We can only see some of the clusters because the bright core of the Milky Way obscures our view to objects on the other side. But other galaxies, with their own globular clusters show us what our own galaxy probably looks like from afar.
M55 is part of the Messier catalog; a collection of objects that looked comet-like to the eyes of Charles Messier, a French astronomer working in the 18th century. Messier recorded a list of more than 100 objects which could be confused as comets: galaxies, clusters, and nebulae.
Want to see M55 on your own? You’ll need at least a pair of 50 mm binoculars or a small telescope, some nice dark skies, and a clear view to the constellation Sagittarius. Sagittarius looks exactly like a teapot in the sky, hovering above the southern horizon in summer. The further south you go, the higher Sagittarius will be in the sky.
But you’ll never see a view or take an image as detailed as this photo. That’s because it was captured with the ESO’s 4.1-metre (13.4 foot) Visible and Infrared Survey Telescope for Astronomy (VISTA) at ESO’s Paranal Observatory in northern Chile.
May is the best time to try and spot one of the most enduring unsolved mysteries in our Solar System. Ashen Light is a faint glow allegedly seen on the unlit portion of Venus, during its crescent phase, similar to the earthshine often observed on the Moon, though not as bright. It is more commonly observed while Venus occupies the evening sky, as now, than when it is in the morning sky. But no one really knows for sure what causes it.
So what’s the history of our knowledge about this enigmatic glow?
The phenomenon was first noted in 1643, by Italian astronomer Giovanni Battista Riccioli. Though many notable astronomers have reported sightings in the 369 years since, including Sir William Herschel and more recently, Sir Patrick Moore, many others have failed to see the effect, leading to claims that it is due to nothing more than observer error, an illusion, atmospheric effect or equipment malfunction. Things are not helped by the fact that nobody has managed to capture an image of Ashen Light, yet.
As the month progresses, Venus nears the Sun, ready for its transit on June 5th to 6th and the planet’s crescent phase will increase in diameter during the month, from 37 arcseconds to 56 arcseconds. The best option for amateur astronomers hoping to catch a fleeting glimpse is to use an occulting bar to block the bright crescent, making any glow present on the unlit portion of Venus, more visible.
There is much controversy and many theories as to the cause of Ashen Light. The Keck 1 telescope on Hawaii reported seeing a subtle green glow and suggested it could be produced as ultraviolet light from the Sun splits molecules of carbon dioxide, known to be common in Venus’ atmosphere, into carbon monoxide and oxygen, but the green light emitted as oxygen recombines to form O2 is thought too faint to explain the effect. Another more likely theory is that multiple lightning strikes are illuminating Venus’ skies. Though the Cassini spacecraft flew by Venus twice on it’s voyage to Saturn and failed to detect the high frequency radio noise we associate with thunderstorms on Earth, in 2007 Venus Express did detect low frequency ‘whistler waves’ that can also result from lightning. It could also be the Venusian equivalent of aurorae.
By far the most bizarre theory, and my personal favourite, was proposed in the early 19th century by the Bavarian astronomer Franz von Gruithuisen, who suggested that Ashen Light was the result of fires lit to clear land for farming on Venus, or to celebrate the coronation of a new Venusian Emperor!
Infrared imaging of the Sombrero Galaxy (M104) reveals both elliptical and disk structures.
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The Sombrero galaxy has a split personalty, according to recent observations by NASA’s Spitzer Space Telescope. Infrared imaging has revealed a hazy elliptical halo of stars enveloping a dual-structured inner disk; before this, the Sombrero galaxy was thought to be only disk-shaped.
Spitzer’s heat-seeking abilities reveal both stars and dust within the Sombrero galaxy, also known as Messier 104 and NGC 4594. The starlight detected at 3.5 and 4.6 microns is represented in blue-green while the dust imaged at 8.0 microns is shown in red.
In addition, Spitzer discerned that the flat disk within the galaxy is made up of two sections — an inner disk composed almost entirely of stars with no dust, and an outer ring containing both dust and stars.
The galaxy’s dual personality couldn’t be so clearly seen in previous visible-light images.
Hubble image of M104. (NASA/The Hubble Heritage Team STScl/AURA)
“The Sombrero is more complex than previously thought,” said Dimitri Gadotti of the European Southern Observatory in Chile and lead author of the report. “The only way to understand all we know about this galaxy is to think of it as two galaxies, one inside the other.”
Although it might seem that the Sombrero is the result of a collision between two separate galaxies, that’s actually not thought to be the case. Such an event would have destroyed the disk structure that’s seen today; instead, it’s thought that the Sombrero accumulated a lot of extra gas billions of years ago when the Universe was populated with large clouds of gas and dust. The extra gas fell into orbit around the galaxy, eventually spinning into a flattened disk and forming new stars.
This is one of the first galaxies to be seen with such a dual structure — even though M104 has been known about since the mid-1700s.
“Spitzer is helping to unravel secrets behind an object that has been imaged thousands of times,” said Sean Carey of NASA’s Spitzer Science Center at CalTech. “It is intriguing Spitzer can read the fossil record of events that occurred billions of years ago within this beautiful and archetypal galaxy.”
At a magnitude of +8, the Sombrero galaxy is just beyond the limit of naked-eye visibility but can be seen with small telescopes (4-inch/100 mm or larger). It is 28 million light-years away and can be found in the night sky located 11.5° west of Spica and 5.5° northeast of Eta Corvi.
Screenshot for Android, telescope control for SkySafari3. Courtesy AWB
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Celebrate the last two weeks of Global Astronomy Month and get a great price on the very popular SkySafari 3 apps for Apple and Android mobile devices and Mac OS X. Not only will you get an app that has been called a ‘game-changer’ for astronomy software, but during a special promotion, 30% of proceeds from all SkySafari sales will be donated to Astronomers Without Borders to support their wonderful programs.
All three versions of SkySafari 3 — Basic, Plus and Pro – are now at significant discounts, and if you’ve been considering purchasing SkySafari, now is the time, especially since you can support the great work of Astronomers Without Borders at the same time.
SkySafari 3 – $1.99 (regularly $2.99). 120,000 stars and 220 star clusters, nebulae, and galaxies. Solar system’s major planets and moons using NASA spacecraft imagery, 20 asteroids and comets.
SkySafari 3 Plus – $11.99 (regularly $14.99). Wired or wireless telescope control with accessories sold separately. 2.5 million stars, 31,000 deep sky objects (with entire NGC/IC catalog), over 4,000 asteroids, comets, and satellites.
SkySafari 3 Pro – $39.99 (regularly $59.99). Wired or wireless telescope control with accessories sold separately. 15 million stars (most of any astronomy app), 740,000 galaxies to 18th magnitude, over 550,000 solar system objects including every known comet and asteroid.
Mike Simmons, who leads AWB, told Universe Today that this astronomy outreach organization really could use financial help.
“We do probably a half-million dollars in programs each year based on the hard work of passionate amateur astronomers and educators around the world,” he said, all on way less than $25,000 a year.
“This can’t be sustained, of course, and our programs — and everyone’s expectations of us — continue to grow,” Simmons wrote. “This is really, really important to us. 2012 presents many opportunities and we’re working on them. But we need to convert some of the passion we have in abundance to income to keep it going. If we can’t do it this year then I’m not sure we can do it in the future.”
Another way to help AWB is to purchase special eclipse glasses for the upcoming eclipse and the Venus transit – for which AWB has big plans for helping people around the world observe this very infrequent event.
Also, there is the a program allowing people to buy a quality small refractor and have a second one donated to a club or school in a developing country.
For more information, check out Astronomers Without Borders and the SkySafari 3 app sale, the eclipse glasses and the BOGO for a small refractor telescope for you and a needy school.
Thanks in advance for your support of a great organization!
