The discovery of water on Mars has scientists asking whether they're could have once been life on the Red Planet. It's a big question - and it's prompted us to follow up with a few of our own, such as: what is our relationship to the cosmos? How do we find meaning in a universe that is destined to end?
Plus, in response to Seth's appearance on Larry King Live: have aliens visited Earth?
If you missed Seth on Larry King Live, check out our blog and watch the videos. You can read Seth's article about the experience here.
- Janice Bishop - Planetary Scientist at the SETI Institute and at NASA Ames Research Center
- Roy Gould - Education Analyst at the Harvard-Smithsonian Center for Astrophysics