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
