From PBS Space Time.
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A few weeks ago a large team of gravitational wave astronomers announced something pretty wild. The moderately confident detection of pervasive ripples in the fabric of space time that presumably fills the cosmos, detected by watching for subtle connections between the signals from rapidly spinning cores of dead stars in our galactic neighborhood. In other words, the gravitational wave background has probably been detected using a pulsar timing array.
Thumbnail Image Illustration Credit: Olena Shmahalo for NANOGrav
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01:02 Relativity and Gravitational Waves
02:21 Discovering Gravitational Waves
03:49 Gravitational Waves & Pulsars
05:04 Pulsar Timing Array Discovers GWB
06:48 Understanding the GWB
07:55 Are Pulsars Seeing Gravitational Waves?
09:00 Correlated & Anti-Correlated Pulsar Rates
10:07 Hellings and Downs Curve
11:44 Binary Supermassive Black Holes
13:39 NANOgrav Frequency Spectrum