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

The mystery of how planets and icy objects formed in the farthest reaches of our solar system just took an exciting turn. A ...

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

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, dubbed Planet Nine, could explain the unusual clustering ...

Save guides, add subjects and pick up where you left off with your BBC account. Gravity provides the force needed to maintain the stable orbit of planets around a star and also of moons and ...

These light travel time distances to our eyes change every second because all objects in our solar system are constantly in motion in their orbit around the sun. While gazing at this celestial ...

Save guides, add subjects and pick up where you left off with your BBC account. The Sun and its planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune The different planets ...