Kepler space telescope spots five Earth-sized planets

Previous technology has limited us to only detected very large extrasolar planets, like gas giants, but now we're finally starting to be able to get a sense of how many Earth-sized planets there are.
NASA scientists have announced Kepler has spotted five planets about the size of Earth, orbiting stars in our galaxy.
These planets are orbiting in what is known as the habitable zone, which puts them at a distance from their suns where liquid water could exist. Liquid water is a key ingredient for life to form.
The Kepler telescope has spotted a total of 54 planets within various stars' habitable zones and over 1,200 total planets. The discoveries still need to be confirmed, but given that we've still only explored a minute fraction of the hundreds of billions of stars in the galaxy, it seems less and less likely that we're alone.


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