Once its rings vanish from sight in March 2025, Saturn will look like a pale yellow sphere through most telescopes.

Above the Earth’s surface there are many orbital planes and no pesky oceans to prevent millimeter and centimeter-sized cars from being spaced out there. This gives a rough idea of just how ...

The idea of a hidden moon quietly orbiting our planet conjures images of celestial mystery and intrigue. As space exploration ...

Their findings show that solar systems with a single giant planet have the necessary orbital mechanics at work to create such an object—but that other explanations may still be required.

The north pole of Mars is slowly sinking under the weight of an ice cap that only formed within the past few million years. And, in the process, it's telling us something about what the planet's ...