Our planet is being destroyed.
It is only a matter of time before we will need a new rock to call home.
Fortunately, there are plenty of planets beyond our solar system that are similar in size to Earth and circle stars like our sun.
These planets are known to exist in the "habitable zone," a region that is not too hot or too cold, but just right to support liquid water, a key ingredient for life as we know it to flourish.
The Planetary Habitability Laboratory, maintained by researchers at the University of Puerto Rico, keeps a list of these Earth-like candidates.
The lab has ranked planets in order of their similarity to Earth, taking size, mass, and distance from their host stars into consideration.
Although we are still working on some kind of vehicle get to these planets (that would probably require going faster than the speed of light), here are some good destinations to keep in mind for the future — when either we ruin Earth or before an incoming rock from space ruins us.
10. Kepler-69c
Kepler-69c belongs to a two-planet system located about 2,700 light-years from Earth.
It's about 70 percent larger than the size of Earth and and orbits its sun-like star every 242 days, which is similar to the orbit of Venus around our sun.
Scientists are not sure what Kepler-69c is made of yet, so travelers should be prepared for anything.
9. Gliese-581d
Gliese-581d is one of five planets to be discovered orbiting red dwarf star Gliese 581. It is bigger than 581g, with a mass at least seven times Earth's and twice as big in size.
The planet orbits on the outer edge of the habitable zone and could be warm enough to support clouds, oceans, and rain.
8. HD-40307 g
HD 40307 g is one of six planets to orbit around a star called HD 40307, which is 42 light-years away from Earth.
Although the planet is at least seven times the mass of Earth, scientists believe it could have an Earth-like climate because it orbits its parent star at a distance that is similar to Earth around our sun.
The planet is far enough away from HD 40307 that it is not tidally locked, meaning it rotates on an axis and does not always show the same face to its star and each hemisphere has a proper daytime and nighttime.
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