![]() ![]() ![]() "Having said that, the evidence for the fingerprint of gravitational waves from all of the collaborations is quite promising." "The signal was getting stronger with time and we don't know what would cause that," he said. The black holes at the centre of many of these discoveries are up to about 85 times the mass of our Sun, and the collisions produce sudden bursts of high frequency gravitational waves. Since then LIGO and another detector in Italy called VIRGO have detected dozens of instances of gravitational waves, created by merging black holes, black holes swallowing the dead cores of stars, and neutron stars crashing into each other. LIGO used lasers to detect infinitesimally small changes in the length of 4-kilometre-long pipes, in detectors located 3,000 km apart. Gravitational waves were first discovered in 2015, with the Nobel Prize-winning detection of two merging black holes by the Laser Interferometer Gravitational-wave Observatory (LIGO). "If you're only observing northern hemisphere pulsars or only southern hemisphere pulsars, you're really more restricted than if we combine northern and southern hemisphere collaborations and use all of the pulsars on the sky," Dr Reardon said. The PPTA has been observing 30 pulsars over the past 20 years, the longest of all the telescopes. The data appeared on Thursday in several papers, published simultaneously in The Astrophysical Journal Letters and Research in Astronomy and Astrophysics.ĭaniel Reardon, of Swinburne University and OZGrav, is the lead author of two research papers by the Australian collaboration known as the Parkes Pulsar Timing Array (PPTA). Then the same signal was seen by five separate groups using telescopes all around the world, including Murriyang - CSIRO's radio telescope at Parkes in NSW. ![]()
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