Venus is the closest in size to Earth.
Mars has a 24 hour day like Earth. It is tilted by the same amount that Earth is in relation to its rotational axis. There are many studies that suggest Mars had water on its surface at some point. This leads researchers to believe it is similar to Earth and may have had life thousands of years ago.
Gliese 581d is the most Earth-like planet known to date. It was discovered in 2007. It is estimated to be 20.5 light years from Earth.
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