These ancient cave decorations take thousands of years to appear, building up drip by painstaking drip
A satellite image captured by Landsat 8 shows Mount Vesuvius "peering" through an eerily circular hole in the clouds.
A group of tiny, colorful birds has been singing the exact same tunes for more than 500,000 years — and maybe as long as 1 million years, according to a new study.
Saturn's rings have captured the attention of scientists for as long as they have been seen. Today, missions continue to teach us about these rocky rings.