Virgin Orbit rocket launches 7 US defense satellites

A Virgin Orbit rocket carrying seven U.S. Defense Department satellites was launched from a special Boeing 747 flying off the Southern California coast and streaked toward space Friday night.

Triply eclipsing stellar systems

Stars with the mass of the sun or larger are typically accompanied by one or more orbiting companion stars. The system forms when gravity contracts the gas and dust of an interstellar cloud until clumps develop that are dense ...