A space craft approaches Jupiter's moon Europa in the film Europa Report. (Credit: Wayfare Entertainment)

More to explore:

Is There Life on Venus? (Scitable)

Venus May Have Had Continents and Oceans (Nature News) (Scientific American is part of the Nature Publishing Group)

Was Venus Alive? 'The Signs Are Probably There' (Space.com)

Tiny Saturn Moon ID’d As Good Candidate For Alien Life (Wired)

Planet Profile of Titan (ESA)

The Europa Report: A Report (Scientific American Guest Blog)

Mars vs. Europa: Are we looking in the wrong place for alien life? (NBCNews.com)

Mars Rover Finds Evidence of Ancient Habitability (Nature News)

Next Mars Rover Will Seek Out Signs of Past Life (Scientific American)