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This is Scientific American's 60-Second Space. I'm Michael Moyer Got a minute?

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Earth is the only place where we know for sure that life exists.

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We have liquid water and a strong magnetic field that shields out harmful cosmic radiation.

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But what if Earth isn't the most habitable type of planet?

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Researchers say they've listed the qualities that would make a planet extra-friendly to life, or "superhabitable."

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Their paper is in the journal Astrobiology.

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A "superhabitable" planet should be two or three times the size of Earth.

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The extra surface area provides more room for species to spread out and evolve.

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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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Our "superhabitable" planet should also be well-aged.

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The sun and earth are about five billion years old, middle aged, cosmically speaking.

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But some stars that are slightly smaller and dimmer than our sun are more than 10 billion years old.

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That's a lot of extra time for life to take hold and evolve.

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Astronomers estimate that our Milky Way galaxy is home to around 100 billion planets.

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Compared with planets yet to be found, Earth could barely be making a living.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm Michael Moyer.

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