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1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 ."There are in fact 100 billion galaxies, each of which contains something like a 100 billion stars."
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3 .Well, Carl Sagan would have loved to get the latest estimate of our galaxy's planet count.
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4 .Caltech astronomers set their sites on a star called Kepler 32.
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5 .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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6 .But what's really cool about this particular star, from the astronomers' point of view,
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7 .is that its five planets orbit in a plane that the Kepler telescope sees edge on.
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8 .So the star's light dims each time a planet passes between it and the scope,
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9 .which makes the planets easier to detect.
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10 .Now, taking into account the percentage of M dwarf systems that lie in a similar edge on orientation,
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11 .and the number of planetary systems the Kepler telescope has already detected,
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12 .the researchers figure our galaxy is host to at least 100 billion planets.
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13 .Their calculations are served up in The Astrophysical Journal.
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14 .Many of those planets may be the size of Earth.
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15 .But we're the only planet that produced Carl Sagan.
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16 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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