He examines theories on the conditions required for biological life to arise and how likely it is that such life exists on other planets in our own or other solar systems. (discovermagazine.com)
There may very well be hundreds of other planets in other solar systems that are inhabited by intelligent life that is completely different from us. (religion.blogs.cnn.com)
Ingredients for Life Scientists have gathered enough information about other planets in our solar system to know that none can support life as we know it. (nationalgeographic.org)