Before heading to the gym on Memorial Day, here's everything you need to know about Planet Fitness on the holiday ...

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

There is an object flying through space about 20 light-years from Earth that has intrigued astronomers for quite a while. It ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

THERE are planets beyond our own that could be hiding untouched paradises.  Exoplanet LHS 1140 b is just one of them – and ...

The lone planet confirmed to be in the system is squeezed in between the two, orbiting at a distance similar to Earth's ...

The researchers calculated the results of a Neptune-mass planet with 17 Earth masses colliding and merging with Beta Pictoris b. "The vast stores of heavy metals in Jupiter-mass exoplanets can be ...

Of the roughly 6,000 exoplanets we’ve discovered, a significant number are in the apparent habitable zones of their stars.

Astronomers may have found a new candidate for the role of the ninth planet in the solar system.

According to their work, Jupiter's radius was once two to two-and-a-half times its current radius—large enough to contain ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner consistent with a large, distant planet.