When We Find Earth 2.0, What's Next?
Briefly

When will we find another Earth? It's a good question. As we're learning, space is filled with a great many wildly differing worlds, and it's natural to wonder if there's an Earth 2.0 out there, or if they're all truly, well, alien.
When will we find another Earth?
Of the 5,500 or so exoplanets found to date, about 100 are close in size to our home planet. But there's more to Earth than just size. If you're looking for an exact replica...then those odds look pretty long.
Of the 5,500 or so exoplanets found to date, about 100 are close in size to our home planet.
Read at www.scientificamerican.com
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