Scientists discover neutron star so massive it almost shouldn't exist - NBCNewsMACH
into a sphere only about 15 miles in diameter. That approaches the theoretical limits of how massive and compact a single object can become without crushing itself down under the force of its own gravitational pull into a black hole.
"Neutron stars have this tipping point where their interior densities get so extreme that the force of gravity overwhelms even the ability of neutrons to resist further collapse," study co-author Scott Ransom, an astronomer at the National Radio Astronomy Observatory, said in a statement."Each 'most massive' neutron star we find brings us closer to identifying that tipping point and helping us to understand the physics of matter at these mind-boggling densities.
Astronomers measured the mass of this pulsar through a phenomenon known as"Shapiro Delay." In essence, the gravity from the pulsar'scompanion — a small, dense star that co-orbits the neutron star — warps the fabric of space and time around it to a degree proportionate to the white dwarf's mass. These distortions in space-time delay pulses from the pulsar by tens of millionths of a second when it passes behind the white dwarf from the viewpoint of Earth.
"At Green Bank, we're trying to detect gravitational waves from pulsars," he said."In order to do that, we need to observe lots of millisecond pulsars."
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