The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...

There may be an undiscovered planet in the outer solar system whose presence is revealed by the strange orbit of objects beyond the eighth planet Neptune. The tantalizing prospect of a ninth ...

Mars’s axis of rotation is tilted 25.2 degrees relative ... to a degree unlike any other planet in the solar system. The planet’s northern hemisphere consists mostly of low-lying plains ...

Everyone knows about the Solar System, and the planets that make it up. They’re in space, orbiting the Sun, in an order we all at least used to be able to recite. But it was not always so.