Reigniting concerns about escalating arms race in space, missile strike creates 1,500 pieces of space junk, forces astronauts to take cover from move US calls 'reckless'

Avi Loeb's Galileo Project will seek out objects made by existing or extinct otherworldly cultures; theoretical physicist has clashed with scientific establishment over theories

Microbiologist says lack of water means lifeforms 'wouldn't stand a chance' of surviving in the planet's clouds, but says there might be enough on Jupiter for organisms to exist

Billionaire businessman and his brother are slated to board a rocket for a brief journey to space on July 20

Beijing officials say debris fell into sea near the Maldives; uncontrolled re-entry of such a large object had sparked concerns about possible damage and casualties

But chances of large segment of Long March-5B striking land seen as extremely low; uncontrolled reentry into atmosphere expected early Sunday

Construction set to begin in 2025 for ring-shaped space station that will rotate to generate artificial gravity; no info yet on cost of project or expected prices

Black holes can go months or years before gobbling up last of dead star’s remains, physicists say after detecting pattern of radio emissions from aftermath of star’s destruction

Picture taken Wednesday shows sunlight coming across the surface of the planet, as well as its north pole and largest volcano

The planets align in a rare celestial dance -- more than 730 million kilometers apart, but closer to each other than at any time in almost 400 years