Kepler-452b is the most Earth-like planet ever discovered, a place with just enough sunlight to possibly support the crops and house plants of life forms like ourselves.

But don't pack your bags just yet. While the planet might seem like a tantalizing target for NASA's next mission, it's extremely unlikely that human beings will ever set foot on Kepler-452b, thanks to the 1,400 light-years they would have to travel to get there.

The separate discovery of the closest confirmed rocky exoplanet to Earth, HD 219134b, was announced by NASA on Thursday — that one's only 21 light-years away.

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