Exoplanets – there are a lot of them

Exoplanets are planets that orbit other stars, not our star the Sun. Look at this great drawing of exoplanets from the comic xkcd. There are a lot of planets out there, beyond our own solar system. Will we ever visit any of them? Is there life on any of them? And what kind of life – intelligent, bacterial, multi-cell?

Planets are turning out to be so common, that to show all the planets in our galaxy, this chart would have to be nested in itself --- with each planet replaced by a copy of the chart itself --- at least three levels deep. http://imgs.xkcd.com/comics/exoplanets.png




Watch this video clip from Nova Science NOW to see how astronomers find these planets around other stars.

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