Planets Similar to Earth in the Universe

Planets Similar to Earth in the Universe - Since scientist found that there is a planet orbiting a star like the sun in 1995, to date, scientists all over the world have found more than 2,000 alien planets. Most of them were found by Kepler space telescope that was launched in 2009.

Kepler space telescope was assigned to find if there’s any earth like planets inside the Milky Way galaxy and can support life on its surface.

These planets must be relatively small and rocky, and orbits in the habitable zone of its star, meaning that it positioned far enough so liquid water can exist in that planet. Those planets also must have atmospheric composition. And this is what Kepler found so far:

Gliese 667Cc
This planet is around 22 light-years from Earth. It is 4.5 times as massive as Earth, but researchers aren't sure whether or not it's rocky. Gliese 667Cc completes one orbit around its host star in 28 days only, but that star is a red dwarf considerably cooler than the sun, so the exoplanet is thought to lie in the habitable zone. However, Gliese 667Cc — which was discovered with the European Southern Observatory's 3.6-meter telescope in Chile — may orbit close enough in to be baked by flares from the red dwarf.

Kepler-22b is 600 light-years away from us. It was the first Kepler planet found in the habitable zone of its parent star, but the world is considerably larger than Earth — about 2.4 times our planet's size. It's unclear if this "super-Earth" planet is rocky, liquid or gaseous. Their one year is about 290 days long.

Kepler-69c, about 2,700 light-years away, is around 70 percent larger than Earth. So, once again, researchers are unsure about its composition. The planet completes one orbit every 242 days, making its position within its solar system comparable to that of Venus of our solar system. However, Kepler-69c's sun is about 80 percent as luminous as the sun, so the planet appears to be in the habitable zone.

This planet is about 40 percent larger than Earth and orbits a star much cooler than our sun. Its 267-day orbit, however, puts Kepler-62f squarely within the habitable zone. It’s located around 1,200 light-years away from here.

This planet is at most 10 percent larger than Earth, and it also appears to reside in the habitable zone of its star, though on the zone's outer edge; Kepler-186f receives just one-third of the energy from its star that Earth gets from the sun. Kepler-186f's parent star is a red dwarf, so the alien world is not a true Earth twin. The planet lies about 500 light-years from Earth.

This world, is the most Earth-like planet found so far. Its parent star is very similar to our sun, and the planet orbits in the habitable zone. At 1.6 times the size of Earth, Kepler-452b has a "better than even chance" of being rocky, its discoverers have said. Kepler-452b resides 1,400 light-years from Earth.

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