"We would need to consider the possibility that the source was created (or trapped as a primordial black hole) by a highly advanced technological civilization," Harvard's Avi Loeb writes.

An exoplanet is any planet beyond our solar system. Most of them orbit other stars, but some free-floating exoplanets, called ...

Satellites that retire are deorbited into a graveyard orbit within 25 years of their missions ending. This is the case with ...

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

Gilmour is currently targeting no earlier than (NET) July 2 for the debut launch of Eris-1, from Pad 1 at the company's Bowen ...