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The stellar remnants are neutron stars, the corpses that remain after massive stars collapse in on themselves. These dead stars are so dense that their electrons collapse onto their protons鈥攈ence, neutron star. Their extreme density also makes them a venue for exotic physics: specifically, theyve been proposed as a source of axions, a hypothetical particle that could contribute to the universes dark matter content. New research, published earlier this month in Physical Review Letters, puts constraints on how axion-like particles might couple with photons, based on spectral and temporal data from a neutron star merger roughly 130 million light-years away. Axion-like particles or ALPs are a more general class of hypothetical dark matter candidates than axions, and scientists believe their nature could be revealed by studying photons and constraining the mass range of the particles. The axion-like particles produced in t
stanley cup he neutron star merger escape the remnant and decay back into two photons, the team wrote in the paper, producing an electromagnetic signal detectable to telescopes. The data was collected from 2017 observations of the collision taken by the Fermi Large Area Telescope Fermi-LAT . For a neutron star merger, theres a unique opportunity where you cou
stanley spain ld get the photon signal, said Bhupal Dev, a physicist at Washington University in St. Louis and lead author of the study, in a phone call with Gizmodo. We could utilize this multime
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in the universe. You might wonder why. Ultimately, theyre trying to tell the universes story. We wanted to know how star formation history proceeded, Kari Helgason, scientist at the Max Planck Institute for Astrophysics in Germany, to
stanley cup ld Gizmodo. The entire universe is diffuse with extragalactic background light or EBL, photons emitted by all of the galaxies stars in infrared, optical, and ultraviolet wavelengths. Going back in time, this light is the sum of all of the light emitted by stars from the Big Bang up until the moment and distance you look鈥攔emember, distance
stanley isolierkanne is the same as time in space, so looking at a farther region of space means looking at fewer stars. The EBL can weaken gamma rays. So, scientists measured the gamma rays coming from distant quasars to see whether they carried the signature of a shadow from this starlight.
cups stanley With this information, the scientists can make a statement about the rate of star formation over time. Researchers analyzed gamma rays from nine years of data collected by the Fermi Gamma-ray Space Telescope. Specifically, they looked at 739 blazars, which are black holes spewing jets of matter pointed at the Earth, and one gamma-ray burst. These objects dated back 200 million to 11.6 billion years. They applied an equation to all of the data that calculated the total background light, according to the new study published in Science. The results were consistent with past attempts to measure the extragalactic background light, showing th