A team of scientists has made the first experimental measurements of laser-induced motions of miniature lightsails in the lab.

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Conflicting distance measurements have added to the uncertainty. One data source places one object at 6,500 light years away, ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...