Comet Leonard, which last passed by Earth 80,000 years ago, has been dazzling the night sky before Christmas, and there's only a few days left to see the celestial object before it disappears forever.

BERLIN — Waking up after almost three years of hibernation, a comet-chasing spacecraft sent its first signal back to Earth on Monday, prompting cheers from scientists who hope to use it to land the ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. A decade ago, scientists at the European Space Agency (ESA) had just wrapped up the yearslong ...