SpaceX Crew-2 on Track for Launch April 23, NASA Celebrates Earth Day in Space Today

A SpaceX Falcon 9 rocket with the company’s Crew Dragon spacecraft onboard is in view on the launch pad at Launch Complex 39A on Tuesday, April 20, 2021, as preparations continue for the Crew-2 mission at NASA’s Kennedy Space Center in Florida. NASA’s SpaceX Crew-2 mission is the second crew rotation mission of the SpaceX …

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Redefining a Heavy Collision

Could the biggest — literally — gravitational-wave discovery yet be something other than what it initially seemed? The post Redefining a Heavy Collision appeared first on Sky & Telescope.