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Record breaker! Milky Way's most monstrous stellar-mass black hole is sleeping giant lurking close to Earth

Astronomers have discovered the most massive stellar-born black hole ever seen in the Milky Way, and it lies relatively close to Earth.

Record breaker! Milky Way's most monstrous stellar-mass black hole is sleeping giant lurking close to Earth

I flew Boeing's Starliner spacecraft in 4 different simulators. Here's what I learned (video, photos)

Boeing Starliner astronauts spent hundreds of hours in simulators preparing for Crew Test Flight, which lifts off May 6. I got a brief taste of what t...

I flew Boeing's Starliner spacecraft in 4 different simulators. Here's what I learned (video, photos)

NASA's Mars sample return plan is getting a major overhaul: 'The bottom line is $11 billion is too expensive'

NASA is asking its various research centers as well as private industry for new ideas about how to get Mars samples back to Earth relatively quickly a...

NASA's Mars sample return plan is getting a major overhaul: 'The bottom line is $11 billion is too expensive'

NASA astronaut Loral O'Hara missed the total solar eclipse, but saw Earth 'moving' below her during spacewalk (photos)

NASA astronaut Loral O'Hara missed watching an eclipse from the ISS by days. But she did participate in the 4th all-woman spacewalk, and has a unique ...

NASA astronaut Loral O'Hara missed the total solar eclipse, but saw Earth 'moving' below her during spacewalk (photos)

These 3 stars are losing weight fast — thanks to stellar winds way stronger than the sun's

Astronomers have measured the stellar winds of three sun-like stars for the first time, finding that the objects are losing mass at a rate as great as...

These 3 stars are losing weight fast — thanks to stellar winds way stronger than the sun's

Space-based solar power may be one step closer to reality, thanks to this key test (video)

A first-of-its-kind lab demonstration shows how solar power transmission from space could work.

Space-based solar power may be one step closer to reality, thanks to this key test (video)