A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Astronomers have discovered a significant “growth spurt” in a rogue planet outside of our solar system. The free-floating planet is currently consuming gas and dust from its surroundings at a rate of ...

In the 30 years since the discovery of 51 Pegasi b, more than 6,000 planets outside our Solar System have been catalogued. Two modern-day explorers explain how.

The asteroid belt may seem permanent, but it is far from static. Its slow decline reveals a more violent past when more ...

NASA has gone silent just hours before humans get their most detailed look at the mysterious object traveling through the ...

According to NASA, today (3 October) is actually the day when it's going to come 'closest' to Mars, though closest in this case is still 18.6 million miles, which is a really long way.