Astronomers have detected five possible alien planets circling the star Tau Ceti, which is less than 12 light-years from Earth — a mere stone’s throw in the cosmic scheme of things. One of the newfound worlds appears to orbit in Tau Ceti‘s habitable zone, a range of distances from a star where liquid water can exist on a planet’s surface.
“This discovery is in keeping with our emerging view that virtually every star has planets, and that the galaxy must have many such potentially habitable Earth-sized planets,” study co-author Steve Vogt, of the University of California, Santa Cruz, said in a statement. “They are everywhere, even right next door.”
The five planet candidates are all relatively small, with minimum masses ranging from 2 to 6.6 times that of Earth. The possibly habitable world, which completes one lap around Tau Ceti every 168 days, is unlikely to be a rocky planet like Earth, researchers said.
“It is impossible to tell the composition, but I do not consider this particular planet to be very likely to have a rocky surface,” lead author Mikko Tuomi, of the University of Hertfordshire in England, told SPACE.com via email. “It might be a ‘water world,’ but at the moment it’s anybody’s guess.”
Spotting signals in the noise
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