Space

Microsoft co-founder Paul Allen and aerospace pioneer Burt Rutan are building the world’s biggest plane to help launch cargo and astronauts into space, in the latest of several ventures fueled by technology tycoons clamoring to write America’s next chapter in spaceflight.

Earth has been told to brace for a possible satellite collision as an orbiting telescope weighing nearly three tons has spun out of control and is plummeting homewards.

A NASA spacecraft orbiting the asteroid Vesta is revealing new details about the huge space rock's surface, including a massive mountain that rises taller than Mt. Everest on Earth.

A defunct NASA science satellite is expected to fall back to Earth on Friday, showering debris somewhere on the planet although scientists cannot predict exactly where, officials said.

A pair of spacecraft rocketed toward the moon Saturday on the first mission dedicated to measuring lunar gravity and determining what’s inside Earth’s orbiting companion – all the way down to the core.