The comet should remain viewable through telescopes until September as it approaches the Sun, then emerge again in December on its outbound leg.

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

A mystery alien object that has come from interstellar space has been ­spotted travelling through the solar system. The object, thought to be about 20km in diameter, is likely to be a comet or ...

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 ...

NASA has discovered an interstellar comet that's wandered into our backyard. The space agency spotted the object with the sky ...

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 ...