astro-news from Institute of Astronomy Library in Inoreader
NASA's Fermi Space Telescope Reveals New Source of Gamma Rays »
posted on Jul 31 2014 16:00:00 UTC via NASA Breaking News
Observations by NASA's Fermi Gamma-ray Space Telescope of several stellar eruptions, called novae, firmly establish these relatively common outbursts almost always produce gamma rays, the most energetic form of light.
Comet mission must not keep space fans in the dark »
posted on Jul 31 2014 16:57:00 UTC via Science news and science jobs from New Scientist - New Scientist
The European Space Agency should change tack and not sit on pictures from a pioneering mission to a comet, says space science writer Daniel Fischer






Rosetta:Catching up with the comet's coma »
posted on Jul 31 2014 10:13:00 UTC via ESA Science & Technology: Home page
With the incredible images of comet 67P/Churyumov-Gerasimenko's nucleus grabbing most of the attention over the last few weeks, we shouldn't forget about the comet's coma. Of course, you can still find the most recent image of the nucleus later on in this post, but first let's talk about coma and activity.
Hubble Shows Farthest Lensing Galaxy Yields Clues to Early Universe »
posted on Jul 31 2014 16:00:00 UTC via NASA Breaking News
Astronomers using NASA's Hubble Space Telescope have unexpectedly discovered the most distant galaxy that acts as a cosmic magnifying glass.
Hubble Shows Farthest Lensing Galaxy Yields Clues to Early Universe »
posted on Jul 31 2014 14:00:00 UTC via HubbleSite NewsCenter -- Latest News Releases

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Astronomers using NASA's Hubble Space Telescope have unexpectedly discovered the most distant cosmic magnifying glass yet, produced by a monster elliptical galaxy. The galaxy, seen here as it looked 9.6 billion years ago, is so massive that its gravity bends, magnifies, and distorts light from objects behind it, a phenomenon called gravitational lensing. In the Hubble image, the galaxy is the red object in the enlarged view at left.

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AUDIO: Why the Moon is shaped like a lemon »
posted on Jul 30 2014 16:54:51 UTC via BBC News | Science & Environment | World Edition
Professor of planetary sciences Ian Garrick-Bethell explains what gave the Moon its unusually distorted shape.
Velocity anti-correlation of diametrically opposed galaxy satellites in the low-redshift Universe »
posted on Jul 20 2014 00:00:00 UTC by Neil G. Ibata via Nature

Velocity anti-correlation of diametrically opposed galaxy satellites in the low-redshift Universe

Nature 511, 7511 (2014). doi:10.1038/nature13481

Authors: Neil G. Ibata, Rodrigo A. Ibata, Benoit Famaey & Geraint F. Lewis

Recent work has shown that the Milky Way and the Andromeda galaxies both possess the unexpected property that their dwarf satellite galaxies are aligned in thin and kinematically coherent planar structures. It is interesting to evaluate the incidence of such planar structures in the larger galactic population, because the Local Group may not be a representative environment. Here we report measurements of the velocities of pairs of diametrically opposed satellite galaxies. In the local Universe (redshift z < 0.05), we find that satellite pairs out to a distance of 150 kiloparsecs from the galactic centre are preferentially anti-correlated in their velocities (99.994 per cent confidence level), and that the distribution of galaxies in the larger-scale environment (out to distances of about 2 megaparsecs) is strongly clumped along the axis joining the inner satellite pair (>7σ confidence). This may indicate that planes of co-rotating satellites, similar to those seen around the Andromeda galaxy, are ubiquitous, and their coherent motion suggests that they represent a substantial repository of angular momentum on scales of about 100 kiloparsecs.

Misaligned protoplanetary disks in a young binary star system »
posted on Jul 30 2014 00:00:00 UTC by Eric L. N. Jensen via Nature

Misaligned protoplanetary disks in a young binary star system

Nature 511, 7511 (2014). doi:10.1038/nature13521

Authors: Eric L. N. Jensen & Rachel Akeson

Many extrasolar planets follow orbits that differ from the nearly coplanar and circular orbits found in our Solar System; their orbits may be eccentric or inclined with respect to the host star’s equator, and the population of giant planets orbiting close to their host stars suggests appreciable orbital migration. There is at present no consensus on what produces such orbits. Theoretical explanations often invoke interactions with a binary companion star in an orbit that is inclined relative to the planet’s orbital plane. Such mechanisms require significant mutual inclinations between the planetary and binary star orbital planes. The protoplanetary disks in a few young binaries are misaligned, but often the measurements of these misalignments are sensitive only to a small portion of the inner disk, and the three-dimensional misalignment of the bulk of the planet-forming disk mass has hitherto not been determined. Here we report that the protoplanetary disks in the young binary system HK Tauri are misaligned by 60 to 68 degrees, such that one or both of the disks are significantly inclined to the binary orbital plane. Our results demonstrate that the necessary conditions exist for misalignment-driven mechanisms to modify planetary orbits, and that these conditions are present at the time of planet formation, apparently because of the binary formation process.

Mystery of lemon-shaped Moon solved »
posted on Jul 30 2014 17:14:50 UTC via BBC News | Science & Environment | World Edition
Tides and spin gave the Moon its strange lemon shape more than four billion years ago, research reveals.
ALMA Finds Double Star with Weird and Wild Planet-forming Discs »
posted on Jul 30 2014 17:00:00 UTC via ESO
Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have found wildly misaligned planet-forming gas discs around the two young stars in the binary system HK Tauri. These new ALMA observations provide the clearest picture ever of protoplanetary discs in a double star. The new result also helps to explain why so many exoplanets — unlike the planets in the Solar System — came to have strange, eccentric or inclined orbits. The results will appear in the journal Nature on 31 July 2014.
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Leaving Earth made the moon lemon-shaped »
posted on Jul 30 2014 17:00:00 UTC via Science news and science jobs from New Scientist - New Scientist
The moon has odd lemon-like bulges on each side. A new model shows they were caused by the pull of Earth's gravity when the moon was young






Pigeon paradox reveals quantum cosmic connections »
posted on Jul 30 2014 17:00:00 UTC via Science news and science jobs from New Scientist - New Scientist
A thought experiment has exposed a new kind of quantum link that could connect every particle in the universe, all the time






Astronomers weigh up Milky Way »
posted on Jul 30 2014 00:11:55 UTC via BBC News | Science & Environment | World Edition
The Milky Way is lighter than previously thought and is only about half the mass of a neighbouring galaxy, researchers conclude.
Gaia:Gaia: 'Go' for science »
posted on Jul 29 2014 12:58:00 UTC via ESA Science & Technology: Home page
Following extensive in-orbit commissioning and several unexpected challenges, ESA's billion-star surveyor, Gaia, is now ready to begin its science mission.
‘Go’ for science »
posted on Jul 29 2014 13:42:45 UTC by emily via Gaia blog

Following the extensive in-orbit commissioning review and after encountering the unexpected challenges highlighted previously on the blog, Gaia is now ready to begin its science mission.

Read the announcement published today on the ESA Portal: Gaia: 'Go' for science

And for a full quantitative analysis of Gaia’s expected science performance based on the results of commissioning, see: Commissioning review: Gaia ready to start routine operations

Perseid Meteors vs. the Supermoon »
posted on Jul 28 2014 22:54:34 UTC via Science @ NASA
Which is brighter--a flurry of Perseid fireballs or a supermoon? Sky watchers will find out this August when the biggest and brightest full Moon of 2014 arrives just in time for the peak of the annual Perseid meteor shower.
Mars Rover Sets Off-World Driving Record »
posted on Jul 28 2014 20:30:23 UTC via Science @ NASA
NASA's Opportunity Mars rover, which landed on the Red Planet in 2004, now holds the off-Earth roving distance record after accruing 25 miles (40 kilometers) of driving, and is not far from completing the first extraterrestrial marathon. The previous record was held by the Soviet Union's Lunokhod 2 rover.
NASA’s Long-Lived Mars Opportunity Rover Sets Off-World Driving Record »
posted on Jul 28 2014 16:00:00 UTC via NASA Breaking News
NASA's Opportunity Mars rover, which landed on the Red Planet in 2004, now holds the off-Earth roving distance record after accruing 25 miles (40 kilometers) of driving. The previous record was held by the Soviet Union's Lunokhod 2 rover.
Cassini Spacecraft Reveals 101 Geysers and more on Icy Saturn Moon »
posted on Jul 28 2014 16:00:00 UTC via NASA Breaking News
Scientists using mission data from NASA’s Cassini spacecraft have identified 101 distinct geysers erupting on Saturn’s icy moon Enceladus. Their analysis suggests it is possible for liquid water to reach from the moon’s underground sea all the way to its surface.
Venus Express:Venus Express: up above the clouds so high »
posted on Jul 28 2014 16:50:00 UTC via ESA Science & Technology: Home page
ESA's Venus Express spacecraft has climbed to a new orbit following its daring aerobraking experiment, and will now resume observations of this fascinating planet for at least a few more months.
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