International astronomers said on Thursday they have found the fourth potentially habitable planet outside our solar system with temperatures that could support water and life about 22 light-years from Earth.
The team analysed data from the European Southern Observatory about a star known as GJ 667C, which is known as an M-class dwarf star and puts out much less heat than our Sun.
However, at least three planets are orbiting close to the star, and one of them appears to be close enough that it likely absorbs about as much incoming light and energy as Earth, has similar surface temperatures and perhaps water.
The new rocky planet, GJ 667Cc, orbits its star every 28.15 days — meaning its year equals about one Earth month — and has a mass at least 4.5 times that of Earth, according to the research published in Astrophysical Journal Letters. Other planets circling the same star could include a gas-giant and an additional super-Earth.