For decades, Venus, often dubbed “Earth’s twin,” has been depicted as a barren, inhospitable world, its surface locked in an ...

"Mostly dead is slightly alive." Until lately, Mars has been generally considered to be a dead planet — geologically speaking, that is. In stark contrast to Earth, with its constantly shifting ...

While in the field on expedition, I’ve encountered a prevailing wisdom that resonates worldwide: Wildlife is more valuable alive than dead. While the statement seems a bit obvious, the concept ...

Mars Dead or Alive: A Hostile Environment Learn in this Teachers' Domain video segment (5m 17s) about the Mars mission and why scientists are so interested in exploring the red planet.

That life might influence the planet to keep itself alive is a “beguiling idea,” says Tyrrell. “People want to think it’s true.” There are some scientists who still discuss it.