Astronaut Nichole Ayers recently witnessed a phenomenon known as a sprite from the International Space Station.

Maj. Nichole Ayers spoke with Denver7's Ryan Fish from the International Space Station, talking about her mission, her ...

These things take millions of years to go from one stellar neighborhood to another, so this thing has likely been traveling ...

A comet has entered the Solar System from interstellar space and will pass through the inner planets later this year, NASA ...

The space agency spotted the quick-moving object with the Atlas telescope in Chile earlier this week, and confirmed it was a ...

NASA said the comet will make its closest approach to the sun in late October, scooting between the orbits of Mars and Earth -- but closer to the red planet than us at a safe 150 million miles (240 ...

The European Space Agency said Wednesday that scientists have discovered what might be only the third known interstellar ...

Astronomers have discovered a rare instance of a interstellar comet speeding through the solar system. The 3I/ATLAS was first ...