Distant moons, asteroids, and mysterious objects drifting beyond Pluto have yet to be explored.
There's no telling what we may yet discover — but life beyond Earth is a distinct possibility.
During a recent live TED Talk in New York, NASA planetary scientist Jim Green described the four most likely places that we could find life in the solar system.
Keep scrolling to find out what they are and why they're the most exciting spots to search for alien life in the solar system.
1. Mars appears pretty barren now, but there's evidence that it used be a watery world not unlike Earth.
Some scientists think the red planet may have been capable of supporting life: It once had oceans that covered 19% of its surface.
Source: Business Insider
But millions of years ago, solar wind blew away Mars' atmosphere. The oceans dried up and it's surface was bombarded with radiation.
Source: Tech Insider
See the rest of the story at Business Insider