NASA's Goddard Space Flight Center 23 Feb 2018, 15:31 UTC The NASA/ESA Hubble Space Telescope caught sight of a soft, diffuse-looking galaxy that is probably the aftermath of a long-ago galactic collision. Two spiral galaxies, each perhaps much like the Milky Way, swirled together for millions of years. In such mergers, the original galaxies are often stretched and pulled apart as they wrap around a common center of gravity. After a few back-and-forths, this starry tempest settles down into a new, round object. The now subdued celestial body, cataloged as SDSS J162702.56+432833.9, is technically known as an elliptical galaxy.
NASA's Jet Propulsion Laboratory News and Features 22 Feb 2018, 19:09 UTC NASA has a long and successful track record at Mars. Since 1965, it has flown by, orbited, landed and roved across the surface of the Red Planet. What can InSight -- planned for launch in May -- do that hasn't been done before?
Kavli Institute for the Physics and Mathematics of the Universe 22 Feb 2018, 05:00 UTC The moment a supernova becomes visible in the sky has been captured by an amateur astronomer, and has helped an international team of researchers validate theoretical predictions about the initial evolution of such stellar explosions.
Keck Observatory 21 Feb 2018, 23:00 UTC Astronomers have the “all-clear” for an exciting test of Einstein’s Theory of General Relativity, thanks to a new discovery about S0-2’s star status. Up until now, it was thought that S0-2 may be a binary, a system where two stars circle around each other. Having such a partner would have complicated the upcoming gravity test.
Keck Observatory 21 Feb 2018, 18:00 UTC Thanks to lucky snapshots taken by an amateur astronomer in Argentina, scientists have obtained their first view of the initial burst of light from the explosion of a massive star. During tests of a new camera, Víctor Buso captured images of a distant galaxy before and after the supernova's "shock breakout" – when a supersonic pressure wave from the exploding core of the star hits and heats gas at the star’s surface to a very high temperature, causing it to emit light and rapidly brighten.
ESA Space Science 21 Feb 2018, 10:00 UTC Slowed by skimming through the very top of the upper atmosphere, ESA’s ExoMars has lowered itself into a planet-hugging orbit and is about ready to begin sniffing the Red Planet for methane. The ExoMars Trace Gas Orbiter arrived at Mars in October 2016 to investigate the potentially biological or geological origin of trace gases in the atmosphere. It will also serve as a relay, connecting rovers on the surface with their controllers on Earth. But before any of this could get underway, the spacecraft had to transform its initial, highly elliptical four-day orbit of about 98 000 x 200 km into the final, much lower and circular path at about 400 km.
NASA's Goddard Space Flight Center 20 Feb 2018, 19:00 UTC Sometimes on a dark night near the poles, the sky pulses a diffuse glow of green, purple and red. Unlike the long, shimmering veils of typical auroral displays, these pulsating auroras are much dimmer and less common. While scientists have long known auroras to be associated with solar activity, the precise mechanism of pulsating auroras was unknown. Now, new research, using data from NASA’s Time History of Events and Macroscale Interactions during Substorms — or THEMIS — mission and Japan’s Exploration of energization and Radiation in Geospace — shortened to ERG, or also known as Arase — satellite, has finally captured the missing link thought responsible for these auroras. The answer lies in chirping waves that rhythmically pulse the particles that create the auroras.
ESA Top News 20 Feb 2018, 15:55 UTC The Franco-Italian Antarctic research base of Concordia sits 1670 km from the South Pole. On the plateau some 3200 m high, the air is so thin that inhabitants live in a permanent state of hypoxia – lack of oxygen. The closest humans are 600 km away at Russia’s Vostok base. Average temperatures range from –30°C in the summer months to –60°C in the winter. The ‘winterover’ crew who stay during the long cold winter to conduct research do not see the Sun rise above the horizon for four months. The crew learn to cope and live with the threats of cold, darkness, monotony, danger and no possibility of rescue.
NASA's Goddard Space Flight Center 20 Feb 2018, 14:31 UTC The planet Mars has fascinated scientists for over a century. Today, it is a frigid desert world with a carbon dioxide atmosphere 100 times thinner than Earth’s. But evidence suggests that in the early history of our solar system, Mars had an ocean’s worth of water. NASA’s James Webb Space Telescope will study Mars to learn more about the planet’s transition from wet to dry, and what that means about its past and present habitability.
NASA's Goddard Space Flight Center 16 Feb 2018, 14:28 UTC This image from the NASA/ESA Hubble Space Telescope shows the galaxy cluster PLCK G004.5-19.5. It was discovered by the ESA Planck satellite through the Sunyaev-Zel’dovich effect — the distortion of the cosmic microwave background radiation in the direction of the galaxy cluster by high-energy electrons in the intracluster gas. The large galaxy at the center is the brightest galaxy in the cluster, and above it a thin, curved gravitational lens arc is visible. This arc is caused by the gravitational forces of the cluster bending the path of light from stars and galaxies behind it, in a similar way to how a glass lens bends light.