Astronomers reveal when 'Great Comet of 2026' will be visible to naked eye - could YOU see it?

Britons have been handed instructions on how best to see the extraterrestrial visitor - and its bright green glow

US history could be rewritten after 'ancient civilisation older than the pyramids' emerges from lake

One of the treasures is thought to be 700 years older than the Great Pyramid of Giza

Nasa issues major update on astronaut evacuation after 'serious' problem on board space station

The space agency has confirmed new details about the station's first emergency evacuation in history

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