A rare photograph of U.S. astronaut Neil Armstrong on the surface of the moon is among thousands of space photographs in a collection up for auction at Christie's.

When Earth is opposite Mars from the sun, it will appear full because you’re looking directly on the daylit side. But ...

A powerful new telescope in outback Australia has mapped vast areas of the universe in record-breaking time, revealing a million new galaxies and opening the way to new discoveries, the country's ...