Earth is the only planet that can sustain life in our solar system and maybe in the entire universe. Or is it? Over the past few years, the Kepler telescope has been looking for other planets in our galaxy that could potentially hold life and guess what? A few were actually found. They are just the right temperature and size for liquid water to flow on their surface and they are orbiting their stars at the right distance, just like earth. However, they are so distant from us that travelling to one of them would take thousand of years with our current rocket technology. That’s a long time for human beings. What if we can transform a closer planet, like Mars or Venus, to make it habitable? Scientists already thought about that and they call it terraforming, which literally means "earth forming".

Photo used in this episode was originally posted to Flickr by Kevin M. Gill at https://www.flickr.com/photos/53460575@N03/8165909516 and is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license https://creativecommons.org/licenses/by-sa/2.0/deed.en