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TRAPPIST-1 twice as old as our solar system

TRAPPIST-1 twice as old as our solar system

Science
Aug. 11 (UPI) -- Astronomers have narrowed in on a more precise estimate of the TRAPPIST-1 system.Scientists believe the star and its exoplanets are between 5.4 and 9.8 billion years old -- as much as twice as old as our solar system. The sun was born 4.5 billion years ago.In February, NASA announced the discovery of seven Earth-sized planets orbiting TRAPPIST-1, an ultra-cool dwarf located 40 light-years away. Three of the seven planets are located within the star's habitable zone.The habitable zone, however, doesn't guarantee habitability, it simply defines a range of orbital distances at which water could in theory exist as a liquid.Because all seven of the TRAPPIST-1 exoplanets are bunched close to their host star, some astronomers have suggested solar flares could burn away any liquid...