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Archive Home > 2013 > January > 09 > Billions of Earth-size planets in the galaxy

Billions of Earth-size planets in the galaxy

By Alicia Chang / The Bulletin
January 9, 2013

LOS ANGELES — Our Milky Way is home to at least 17 billion planets that are similar in size to Earth, a new estimate suggests. That’s more than two Earth-size planets for every person on the globe.

Just how many are located in the sweet spot where water could exist is “simply too early to....

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