In what can be described as another major milestone towards detection of gravitational waves, scientists on 28 September 2017 announced that a fourth detection of gravitational waves has been made.
This time, the LIGO (Laser Interferometer Gravitational-Wave Observatory) was joined by the Virgo observatory from Europe, which significantly contributed to the improved localization of this astronomical source in the sky and enabled new tests of Einstein’s theory based on the polarization of gravitational waves, said an official statement from the Inter University Centre for Astronomy and Astrophysics (IUCAA), Pune.
Three detectors together delivered a significantly better localization of the source and access to polarizations of gravitational waves. This event, detected on 14 August 2017, is the fourth detection of a merging binary black hole system, the statement explained.
These gravitational waves, if detected, will carry signatures of their origin, explaining much about the nature of gravity and the origin of the universe. They had remained elusive till their detection was first announced last year.