Evidence that Russia is racing to perfect a nuclear-armed spacecraft to target Western satellites is sparking the U.S. and its Allies to strengthen their space defenses.

As Elon Musk's SpaceX works toward a May 19 debut of its third-generation Starship, here's a look back at all the previous test flights to date.

Space Astronomy Meteoroids Rare 'daytime fireball' meteor creates powerful sonic boom as 7-ton space rock explodes above eastern US A fridge-size space rock spectacularly broke apart over Ohio at 40,000 mph, creating a loud boom and a "fireball" that shone in the bright blue daytime sky. The rare sight, which exploded with the equivalent force of 250 tons of TNT, was also seen from space.

Starcloud is a startup that’s racing to build massive data centers in space that supporters say could limit the strain artificial intelligence is placing on terrestrial electric grids. But the fate of Starcloud — and dozens of other space startups ...

Through the years since it was first launched, the Hubble Space Telescope has captured stunning photographs of the Cassiopeia A.