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|Astronomy News -- ScienceDaily|
Updated : Fri, 24 Mar 2017 00:11:43 EDT
Milky Way-like galaxies in early universe embedded in 'super halos'
Astronomers have directly observed a pair of Milky Way-like galaxies seen when the universe was only eight percent of its current age. These progenitors of today's giant spiral galaxies are surrounded by 'super halos' of hydrogen gas that extend many tens-of-thousands of light-years beyond their dusty, star-filled disks.
Publ.Date : Thu, 23 Mar 2017 14:14:05 EDT
Gravitational wave kicks monster black hole out of galactic core
Astronomers have uncovered a supermassive black hole that has been propelled out of the center of the distant galaxy 3C 186. The black hole was most likely ejected by the power of gravitational waves.
Publ.Date : Thu, 23 Mar 2017 13:26:27 EDT
Tracing aromatic molecules in the early Universe
A molecule found in car engine exhaust fumes that is thought to have contributed to the origin of life on Earth has made astronomers heavily underestimate the amount of stars that were forming in the early Universe, a study has found. That molecule is called polycyclic aromatic hydrocarbon. On Earth it is also found in coal and tar. In space, it is a component of dust.
Publ.Date : Wed, 22 Mar 2017 15:27:50 EDT
Fledgling stars try to prevent their neighbors from birthing planets
Stars don't have to be massive to evaporate material from around nearby stars and affect their ability to form planets, a new study suggests.
Publ.Date : Wed, 22 Mar 2017 11:09:50 EDT
Universe's ultraviolet background could provide clues about missing galaxies
Astronomers have developed a way to detect the ultraviolet background of the universe, which could help explain why there are so few small galaxies in the cosmos.
Publ.Date : Wed, 22 Mar 2017 09:24:11 EDT
Comet 67P full of surprises: Growing fractures, collapsing cliffs and rolling boulders
Images returned from the European Space Agency's Rosetta mission indicate the surface of comet 67P/Churyumov-Gerasimenko was a very active place during its most recent trip through the solar system, says a new study.
Publ.Date : Wed, 22 Mar 2017 09:22:34 EDT
Looking for signs of the Big Bang in the desert
The silence of an immense desolate land in which to search for reverberations coming from the time at which everything began. The Simons Observatory will be built in the Chilean Atacama desert at an altitude of several thousand meters for the purposes of studying primordial gravitational waves which originated in the first instants of the Big Bang.
Publ.Date : Tue, 21 Mar 2017 12:39:10 EDT
Comet 67P is constantly undergoing a facelift
Changes that the Rosetta spacecraft discovered on the surface of Comet 67P/Churyumov-Gerasimenko, including the collapse of entire cliffs, were likely driven by seasonal events, according to a new study.
Publ.Date : Tue, 21 Mar 2017 12:25:29 EDT
Astronomers hazard a ride in a 'drifting carousel' to understand pulsating stars
What sounds like a stomach-turning ride at an amusement park might hold the key to unraveling the mysterious mechanism that causes beams of radio waves to shoot out from pulsars -- super-magnetic rotating stars in our galaxy.
Publ.Date : Tue, 21 Mar 2017 11:03:23 EDT
Breaking the supermassive black hole speed limit
A new computer simulation helps explain the existence of puzzling supermassive black holes observed in the early universe. The simulation is based on a computer code used to understand the coupling of radiation and certain materials.
Publ.Date : Tue, 21 Mar 2017 11:03:07 EDT
Mars volcano, Earth's dinosaurs went extinct about the same time
Arsia Mons produced one new lava flow at its summit every 1 to 3 million years during the final peak of activity, about 50 million years ago. The last volcanic activity there ceased about 50 million years ago -- around the time of Earth's Cretaceous-Paleogene extinction, when large numbers of our planet's plant and animal species (including dinosaurs) went extinct.
Publ.Date : Tue, 21 Mar 2017 09:27:44 EDT
Does Mars have rings? Not right now, but maybe one day
Researchers have developed a model that suggests that debris that was pushed into space from an asteroid or other body slamming into Mars around 4.3 billion years ago and alternates between becoming a planetary ring and clumping up to form a moon.
Publ.Date : Tue, 21 Mar 2017 09:27:34 EDT
Less radiation in inner Van Allen belt than previously believed
The inner Van Allen belt has less radiation than previously believed, according to a recent study. Observations from NASA's Van Allen probes show the fastest, most energetic electrons in the inner radiation belt are actually much rarer and harder to find than scientists expected. This is good news for spacecraft that are orbiting in the region and can be damaged by high levels of radiation.
Publ.Date : Tue, 21 Mar 2017 09:26:17 EDT
NASA's Swift mission maps a star's 'death spiral' into a black hole
Astronomers measured the light produced when a sun-like star wandered too close to a 3-million-solar-mass black hole similar to the one at the center of our own galaxy.
Publ.Date : Mon, 20 Mar 2017 16:23:13 EDT
Hubble's glittering frisbee galaxy
Hubble caught a cross-section of NGC 1448, a spiral galaxy located about 50 million light-years from Earth.
Publ.Date : Mon, 20 Mar 2017 12:03:52 EDT
New Hubble mosaic of the Orion Nebula
In the search for rogue planets and failed stars astronomers using the NASA/ESA Hubble Space Telescope have created a new mosaic image of the Orion Nebula. During their survey of the famous star formation region, they found what may be the missing piece of a cosmic puzzle; the third, long-lost member of a star system that had broken apart.
Publ.Date : Fri, 17 Mar 2017 14:05:44 EDT
Scientists make the case to restore Pluto's planet status
Kirby Runyon wants to make one thing clear: regardless of what one prestigious scientific organization says to the contrary, Pluto is a planet. So, he says, is Europa, commonly known as a moon of Jupiter, and so is the Earth's moon, and so are more than 100 other celestial bodies in our solar system that are denied this status under the prevailing definition of 'planet.'
Publ.Date : Fri, 17 Mar 2017 13:12:05 EDT
The rotation axes of stars tell us about how they were born
Using asteroseismology, an international research team has discovered a surprising alignment of the rotation axes of stars in open clusters, shedding light on the conditions in which stars are formed in our galaxy. Using data from Nasa’s Kepler mission, this result was obtained by studying a group of red giants in two old open clusters in the Milky Way.
Publ.Date : Thu, 16 Mar 2017 11:26:18 EDT
Gigantic Jupiter-type planet reveals insights into how planets evolve
A team of astrophysicists studying an enormous and bizarre young planet approximately 300 lights years from Earth has gained a rare glimpse into the final stages of planetary evolution. While astronomers think the vast majority of planets outside our solar system are inside their star system's vast dusty debris disk, this strange planet is far beyond the disk.
Publ.Date : Thu, 16 Mar 2017 09:30:38 EDT
Dark matter less influential in galaxies in early universe
New observations indicate that massive, star-forming galaxies during the peak epoch of galaxy formation, 10 billion years ago, were dominated by baryonic or 'normal' matter. This is in stark contrast to present-day galaxies, where the effects of mysterious dark matter seem to be much greater. This surprising result was obtained using ESO's Very Large Telescope and suggests that dark matter was less influential in the early universe than it is today.
Publ.Date : Wed, 15 Mar 2017 14:38:28 EDT