astrophysics   1558

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On the viability of gravitational Bose–Einstein condensates as alternatives to supermassive black holes | Monthly Notices of the Royal Astronomical Society | Oxford Academic
“It is argued that astrophysical Bose–Einstein condensates (BECs) most likely form through a quasi-static contraction of ultradense cores of neutron stars. Such an evolutionary track would ensure that there is sufficient time left for the nuclear matter to stably liberate the excess of thermal energy, enable the core’s matter to intercommunicate and undergo a phase transition to form stellar BECs.”
theoreticalphysics  blackholephysics  boseeinsteincondensate  darkenergy  neutronstar  astrophysics 
yesterday by danhon
Dark Energy Stars
“Event horizons and closed time-like curves cannot exist in the real world for the simple reason that they are inconsistent with quantum mechanics. Following ideas originated by Robert Laughlin, Pawel Mazur, Emil Mottola, David Santiago, and the speaker it is now possible to describe in some detail what happens physically when one approaches and crosses a region of space-time where classical general relativity predicts there should be an infinite red shift surface. This quantum critical physics provides a new perspective on a variety of enigmatic astrophysical phenomena including supernovae explosions, gamma ray bursts, positron emission, and dark matter.,”
georgechapline  relativity  singularity  star  theoreticalphysics  quantummechanics  astrophysics  boseeinsteincondensate  blackholes  darkenergy  arxiv 
yesterday by danhon
The Metallic Vapor Layers
A natural global layer (usually about 3 miles thick) of sodium atoms exists between about 50 and 65 miles (80 and 105 km) altitude. The sodium originates from the ablation of meteors. The atoms are naturally excited and emit a weak glow near a wavelength of 589 nm (yellow) known as "the sodium D lines". Above the layer, sodium exists in its ionized form (which does not emit yellow light) and below the layer, sodium exists as chemical compounds such as sodium oxide (which also do not emit yellow light).
physics  chemistry  astrophysics  geophysics  esoteric 
4 days ago by kmt
Astronomers Have Found the Universe's Missing Matter
Now, in a series of three recent papers, astronomers have identified the final chunks of all the ordinary matter in the universe. (They are still deeply perplexed as to what makes up dark matter.) And despite the fact that it took so long to identify it all, researchers spotted it right where they had expected it to be all along: in extensive tendrils of hot gas that span the otherwise empty chasms between galaxies, more properly known as the warm-hot intergalactic medium, or WHIM.
physics  astrophysics  astronomy  science 
4 weeks ago by campylobacter
A New World’s Extraordinary Orbit Points to Planet Nine | Quanta Magazine
Astronomers argue that there’s an undiscovered giant planet far beyond the orbit of Neptune. A newly discovered rocky body has added evidence to the circumstantial case for it.
articles  solar_system  astronomy  astrophysics 
5 weeks ago by gmisra
Mathematicians Disprove Conjecture Made to Save Black Holes | Quanta Magazine
Mathematicians have disproved the strong cosmic censorship conjecture. Their work answers one of the most important questions in the study of general relativity and changes the way we think about space-time.
articles  astrophysics  physics 
5 weeks ago by gmisra
The Last of the Universe’s Ordinary Matter Has Been Found | Quanta Magazine
For decades, astronomers weren’t able to find all of the atomic matter in the universe. A series of recent papers has revealed where it’s been hiding.
articles  astrophysics  physics 
5 weeks ago by gmisra
FRB 121102: New Bursts From Older Data
SETI surveys as datamining the existing astronomical observation archive with new techniques, which can produce new results unrelated to SETI
2masto  astrophysics  machinelearning  SETI 
5 weeks ago by mikelynch
Hubble’s Lucky Observation of an Enigmatic Cloud | NASA
ula IRAS 05437+2502 billows out among the bright stars and dark dust clouds that surround it in this striking image from the Hubble Space Telescope. It is located in the constellation of Taurus (the Bull), close to the central plane of our Milky Way galaxy. Unlike many of Hubble’s targets, this object has not been studied in detail and its exact nature is unclear. At first glance it appears to be a small, rather isolated region of star formation, and one might assume that the effects of fierce ultraviolet radiation from bright, young stars probably were the cause of the eye-catching shapes of the gas. However, the bright, boomerang-shaped feature may tell a more dramatic tale. The interaction of a high-velocity young star with the cloud of gas and dust may have created this unusually sharp-edged, bright arc. Such a reckless star would have been ejected from the distant young cluster where it was born and would travel at 200,000 kilometers per hour (124,000 miles per hour) or more through the nebula.

This faint cloud was originally discovered in 1983 by the Infrared Astronomical Satellite (IRAS), the first space telescope to survey the whole sky in infrared light. IRAS was run by the United States, the Netherlands, and the United Kingdom and found huge numbers of new objects that were invisible from the ground.

This image was taken with the Wide Field Channel of the Advanced Camera for Surveys on Hubble. It was part of a “snapshot” survey. These are observations that are fitted into Hubble’s busy schedule when possible, without any guarantee that the observation will take place — so it was fortunate that the observation was made at all. This picture was created from images taken through yellow and near-infrared filters.

Credit: ESA/Hubble, R. Sahai and NASA
Text Credit: European Space Agency (ESA)
bowshock  astrophysics 
6 weeks ago by deprecated

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