Eric Walker added These Black Holes Shouldn’t Exist, but There They Are - The New York Times to a number of topics

Eric Walker added Black holes: Cosmic signal rattles Earth after 7 billion years - BBC News to GW190521

Eric Walker added LIGO and Virgo spotted the first confirmed midsize black hole | Science News to GW190521

Eric Walker added Most massive black-hole merger results in powerful ripple in space-time to GW190521

Eric Walker added a number of links to GW190521, and added GW190521 to Laser Interferometer Gravitational-Wave Observatory (LIGO), Black holes and Virgo interferometer

Eric Walker added a number of topics and a number of links to Black holes, and added Black holes to Outer space

Eric Walker added GW190521 and Congratulations, You Survived Black Hole Week - The New York Times and A Black Hole’s Lunch Provides a Treat for Astronomers - The New York Times to Virgo interferometer, and added Virgo interferometer to Telescopes, observatories and telescope networks and Gravitational-wave astronomy

Eric Walker added GW190521 and a number of links to Laser Interferometer Gravitational-Wave Observatory (LIGO), and added Laser Interferometer Gravitational-Wave Observatory (LIGO) to Observatories and Gravitational-wave astronomy