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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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"There are in fact 100 billion galaxies, each of which contains something like a 100 billion stars."

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Well, Carl Sagan would have loved to get the latest estimate of our galaxy's planet count.

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Caltech astronomers set their sites on a star called Kepler 32.

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It's an M dwarf star, a class that's smaller and cooler than our sun, and accounts for about three quarters of the stars in the Milky Way.

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But what's really cool about this particular star, from the astronomers' point of view,

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is that its five planets orbit in a plane that the Kepler telescope sees edge on.

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So the star's light dims each time a planet passes between it and the scope,

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which makes the planets easier to detect.

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Now, taking into account the percentage of M dwarf systems that lie in a similar edge on orientation,

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and the number of planetary systems the Kepler telescope has already detected,

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the researchers figure our galaxy is host to at least 100 billion planets.

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Their calculations are served up in The Astrophysical Journal.

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Many of those planets may be the size of Earth.

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But we're the only planet that produced Carl Sagan.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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