Stars and galaxies

We might make wishes on stars but there's much more to these balls of gas than simply being twinkly, mystical objects in the night sky. Discover how stars are formed, how they get their names, what makes a galaxy, and the history of constellations.

The Sun’s diameter is 100 times that of Earth’s but its mass is 300,000 times greater and it is 15,000,000°C at its core.

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Polaris is the brightest star in the Ursa Minor constellation, and has been used by sailors for navigating at sea.

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How high can you go? Get the low-down on all that's 'high up' in our fact-packed infographic. Who has flown the highest? Could we really build an elevator to space?

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What was the Star of Bethlehem? Over the years many astronomical explanations have been suggested.

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The story of Astronomer Royal George Biddell Airy and the remarkable Airy Transit Circle telescope he designed at the Royal Observatory Greenwich.

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How the humble prism helped unlock the secrets of what the Universe is made of and where it is heading.

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Meridian astronomy is the meticulous surveying of the stars so that positions and movements of stars can be known accurately.

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The 88 constellations act as a handy map of the skies and a seasonal calendar used from ancient times. But what connects the stars in the same constellation?

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If you could squash the Earth into a ball the size of a marble, it would become a black hole. What are these mysterious entities?

Pulsars are among the most regular but shocking objects in the universe sending out massive bolts of electricity across space.

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