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Image of Earth taken during NASA's Apollo program.

You know that conspiracy theory about another Earth occupied by doppelgangers living similar lives to our own?

Turns out, that might not be just a bunch of science fiction.

In fact, there might be billions of Earths out there.

According to a report published in the Proceedings of the National Academy of Sciences, there is a potentially habitable planet similar to Earth in orbit of approximately one in every five sun-like stars,.

The report, which includes analysis of observations by NASA's Kepler space telescope, suggests that the closest planet with an ocean is only 12 light-years away,

The study estimates that 22 percent of stars are similar to our own sun, meaning as many as 40 billion Earth-size planets may exist in our galaxy,

In 2009, NASA launched the Kepler space telescope with the goal of determining the percentage of stars with potentially habitable planets. The analysis released Monday is the closest the telescope has come to obtaining that information.

However, just because plants are Earth-size doesn't mean they automatically support life, . Efforts to build a telescope that could obtain direct imagery of a planet in a distant galaxy is still ongoing.

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