"Rings are mostly made of ice and small rocks," said William Saunders, a planetary scientist at NASA's Langley Research ...

The moon spent a few million years as a volcanic wasteland, covered with ongoing eruptions that spewed from mountains and ...

Thus, if life had taken longer to get started on Earth, it may have been snuffed out before there was time for intelligent beings, such as humans, to evolve. He suggests this has major ...

It isn’t easy to figure out how the Earth was built, because it happened 4½ billion years ago, and no one was there to watch. So scientists have had to look at what the ... as planets today began as ...

Advertisement Article continues below this ad Because Mars and Earth share so many ... to get an idea of what Mars may have been like in the past. If ancient Mars had liquid water, it would ...

Because Mars and Earth share ... surface once had liquid water. And these instruments have spotted minerals on its surface that scientists can analyze to get an idea of what Mars may have been ...