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Thursday, Feb 25, 2021
In 1964 two Aerobee suborbital rockets were launched with the goal of mapping x-ray sources in the sky. Each rocket contained a directed Geiger counter, so that as the rocket rotated at the peak of its trajectory to measure the direction of x-ray sources. The project discovered eight x-ray sources, including a particularly bright one […]
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In 1993 Stephen Hawking proposed in Black Holes and Baby Universes that there might be “primordial black holes which were formed in the early universe that could be less than the size of the nucleus of an atom, yet their mass could be a billion tons, the mass of Mount Fuji. A black hole weighing […]
Read MoreA ghostly particle that smashed into Antarctica in 2019 has been traced back to a black hole tearing apart a star while acting like a giant cosmic particle accelerator, a new study finds. Scientists investigated a kind of subatomic particle known as a neutrino, which is generated by nuclear reactions and the radioactive decay of […]
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A team of scientists has detected the presence of a high-energy neutrino — a particularly elusive particle — in the wake of a star’s destruction as it is consumed by a black hole. This discovery, reported in the journal Nature Astronomy, sheds new light on the origins of Ultrahigh Energy Cosmic Rays — the highest […]
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Six decades after its discovery, the first black hole ever detected is still causing astronomers to scratch their heads. It turns out that the cosmic behemoth at the heart of the Cygnus X-1 system is 50% more massive than previously thought, making it the heaviest stellar-mass black hole ever observed directly. Based on new observations, […]
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This is an artist’s impression created to visualize the concentration of black holes at the center of NGC 6397. In reality, the small black holes here are far too small for the direct observing capacities of any existing or planned future telescope, including Hubble. It is predicted that this core-collapsed globular cluster could be host […]
Read MoreNew evidence suggests the first known black hole is bigger than previously thought, which may force scientists to reconsider their understanding of how giant stars give rise to black holes. Scientists think stellar-mass black holes, which contain up to a few times the sun’s mass, form when giant stars die and collapse in on themselves. […]
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The first black hole ever discovered still has a few surprises in store. New observations of the black hole–star pair called Cygnus X-1 indicate that the black hole weighs about 21 times as much as the sun — nearly 1.5 times heavier than past estimates. The updated mass has astronomers rethinking how some black hole–forming […]
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New observations of the first black hole ever detected have led astronomers to question what they know about the Universe’s most mysterious objects. Published today (February 18, 2021) in the journal Science, the research shows the system known as Cygnus X-1 contains the most massive stellar-mass black hole ever detected without the use of gravitational […]
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