![]() ![]() Neutron stars are the densest stars in the Universe, with a diameter of up to about 20 kilometres. The international research team has detected gravitational waves from 10 different black-hole mergers and one neutron star collision during the past three years. "This means during the upcoming third observing run, starting early next year, we will be able to detect events further out in space, meaning more detections and potentially gravitational waves from new and yet unknown sources in the Universe," Professor Scott said. ![]() Since the second observing run finished in August 2017, scientists have been upgrading the LIGO and Virgo gravitational-wave detectors to make them more sensitive. "We have also incorporated improved models of the expected signals in our searches." Credit: LIGO-Virgo / Frank Elavsky / Northwestern Graphic showing the masses of recently announced gravitational-wave detections and black holes and neutron stars. The three other black-hole collisions were detected between 9 and 23 August 2017, were between three and six billion light years away and ranged in size for the resulting black holes from 56 to 66 times larger than our Sun. It is also by far the most distant merger observed," Professor Scott said. "This event also had black holes spinning the fastest of all mergers observed so far. The event occurred about nine billion light years away. Scientists detected the event that formed the biggest known black hole from a merger of a binary system of two black holes on 29 July 2017. Professor Susan Scott, who is Leader of the General Relativity Theory and Data Analysis Group at ANU, said the team discovered the four collisions by re-analysing data from Advanced LIGO's first two observing runs. The Australian National University (ANU) is playing a lead role in Australia's involvement with the gravitational wave discovery through a partnership in the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO), which is based in the United States. ![]()
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