Thursday, September 26, 2013

An Interactive Map Of Our Galaxy's Potentially Habitable Planets

Looking up at the night sky, it's hard not to wonder how many other planets might be circling those pinpricks of light – and how many are home to beings gazing back at us.

Today, we are starting to get a handle on the number of roughly Earth-sized exoplanets that might be suitable for life.

How to spot a planet

We can take a good guess at the number of alien Earths thanks to NASA's Kepler space telescope.


When a planet passes in front of its parent star, it blocks some of the star's light. The Kepler telescope looked for distant worlds by measuring this dip in stars' glow.
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