Solar System

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission arriving in 2026 might solve the mystery.

The International Space Station (ISS) is humanity's most expensive object and has been in orbit for 25 years. Read its fascinating history, told in 25 numbers.

From creation myths to political omens, different cultures have had vastly different interpretations of the dramatic natural phenomenon.

These strange objects could explain how water arrived on Earth, but may also be a previously unrecognised threat to our planet. Now, a spacecraft is headed towards one to investigate.

Many stars in our galaxy exist in pairs. Now scientists are finding clues that our Sun may once have had a companion of its own. The question is, where did it go?

The Geminids are an astronomical highlight of the year, creating a spectacular show of shooting stars every December. Scientists are now starting to understand where they came from.

As space agencies venture onto the moons of Jupiter and Saturn to look deep below their frozen surface, might we find new forms of life there?

To understand the life that might survive deep below Mars' surface, we can look to some of the deepest, and oldest, forms of living organism on our own planet.