Scientists ‘hear’ cosmic hum from gravitational waves

Astronomers say they have found the first evidence of a long-theorised form of gravitational waves that create a “background hum” rumbling throughout the universe.
The findings, unveiled on Wednesday, are the product of years of work by hundreds of scientists using radio telescopes in North America, Europe, China, India and Australia, and have been hailed as an important breakthrough that opens a new window into the universe.

Michael Lam is a Research Scientist at the SETI Institute. He was part of the team that conducted the NANOGrav study. He joins us from Washington, DC to discuss the latest updates.

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