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From Viking longships and 14th century carracks to 18th century battleships, the way ships were built evolved greatly between 800 and 1800.

From the 19th century onwards, ships began to be built from iron and steel. Sails were also replaced with steam engines and paddles with propellers.

People have travelled by sea using ships and boats for centuries. The Egyptians, Greeks and Phoenicians made some of the earliest vessels

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

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

19th-century astronomers went beyond cataloguing the skies to understanding their composition and predicting what could not be seen.

How and, more importantly, why do we measure the brightness of stars?

The challenges of measuring everything from a fast-moving, wobbly platform through a haze.

With a telescope we can see billons of miles and travel effortlessly back billions of years in time

Everything you need to know to start you on the road to becoming an amateur or professional astronomer.