Some are almost spheres, like planets, but most are irregular shapes. Some are the size of small stones and pebbles. Some measure hundreds of kilometres across. The largest object is the asteroid ...

"Temperamental" stars that brighten and dim over a matter of hours or days may be distorting our view of thousands of distant ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

Launched in 1990, the Hubble Space Telescope is a joint ESA/NASA project. It has become one of the most important science ...

In 1992 astronomers reported the first planet-size masses around a dead star, the pulsar PSR1257+12, which sits 2,000 light-years away. Three years later came news of the first known exoplanet ...