Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as ...

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

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

They reveal a whole new level of detail in these planet-forming systems. Breakthroughs, discoveries, and DIY tips sent every ...

The National Science Foundation’s Daniel K. Inouye telescope debuted a close-up of the sun captured by its new, ...

Saturn orbits the Sun at roughly 9.69 km/s, maintaining its grand system of rings as it cruises through space. Uranus moves at about 6.81 km/s, spinning on its unique sideways axis as it orbits ...

New data from the James Webb Space Telescope suggests a planet in a faraway solar system was consumed by a star by hurling ...