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1 .This is Scientific American's 60-Second Space. I'm Michael Moyer Got a minute?
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2 .Earth is the only place where we know for sure that life exists.
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3 .We have liquid water and a strong magnetic field that shields out harmful cosmic radiation.
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4 .But what if Earth isn't the most habitable type of planet?
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5 .Researchers say they've listed the qualities that would make a planet extra-friendly to life, or "superhabitable."
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6 .Their paper is in the journal Astrobiology.
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7 .A "superhabitable" planet should be two or three times the size of Earth.
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8 .The extra surface area provides more room for species to spread out and evolve.
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9 .The stronger gravity of a giant-Earth would flatten the surface, allowing for more lakes and archipelagos crucibles of life here.
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10 .Our "superhabitable" planet should also be well-aged.
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11 .The sun and earth are about five billion years old, middle aged, cosmically speaking.
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12 .But some stars that are slightly smaller and dimmer than our sun are more than 10 billion years old.
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13 .That's a lot of extra time for life to take hold and evolve.
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14 .Astronomers estimate that our Milky Way galaxy is home to around 100 billion planets.
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15 .Compared with planets yet to be found, Earth could barely be making a living.
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16 .Thanks for the minute, for Scientific American's 60-Second Space. I'm Michael Moyer.
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