How to find aliens: Follow the photosynthesis - Technology & science - Space - Space.com - msnbc.com

How to find aliens: Follow the photosynthesis - Technology & science - Space - Space.com - msnbc.com: "By calculating where photosynthesis might be possible around the galaxy, scientists are developing a new way to figure out where Earth-like planets might be located. When seeking to figure out where life might evolve, researchers have often focused on the ' habitable zones ' around stars, where the heat from the star is at the perfect level for liquid water to exist on the surface of a planet in that zone. The reasoning there is that wherever there is water on Earth, there is a chance for life."