It was thought that gravitational waves emerging from black hole mergers would be detected in a search of the cosmos. But even after 11 years of search, no such detection has been made. By making use of Parkes, scientists hoped to detect a background 'rumble' of the waves originating from the merging galaxies all through the universe.

As per Astronomy Magazine, physicists are reconsidering information regarding black holes following a search carried out with the Commonwealth Scientific and Industrial Research Organization's (CSIRO) Parkes telescope was not able to find out the background waves that were expected in existence of black hole collisions.

For the first time, Albert Einstein proposed gravitational waves nearly 100 years ago. There is incidental evidence regarding their existence, but the waves have not been detected directly. According to the theory, the merger of the black holes would drive ripples called gravitational waves out via the space-time fabric of the universe.

According to Ryan Shannon of CSIRO, "In terms of gravitational waves, it seems to be all quiet on the cosmic front. However by pushing our telescopes to the limits required for this sort of cosmic search, we're moving into new frontiers, forcing ourselves to understand how galaxies and black holes work".

The team tried to find gravitational waves by calculating the speed at which regular pulsar bursts arrived at Earth.