The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

At 5.06pm UK time, a spacecraft is scheduled to launch on a journey which will take it 1.8 billion miles through our solar ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

The universe is full of icy worlds that scientists ... We’ve found plenty of ice in our solar system, but no consistent liquid water is known on any moon or planetary surface aside from Earth.

Astronomers discover a network of cosmic tunnels linking our solar system to distant galaxies, revealing a dynamic and ...