article_snippet.sent: I think we're one generation away in our solar system, whether it's on an icy moon or on Mars, and
article_snippet.sent: one generation on a planet around a nearby star," former astronaut John Grunsfeld said.
article_snippet.sent: And, former astronaut John Grunsfeld added, who knows what that life will look like?
article_snippet.sent: Once we get out beyond Mars, the likelihood that it's similar to Earth because we share that material gets very, very low," former astronaut John Grunsfeld said.