India, Oct. 12 -- Astrophysicists are uncovering planets that echo worlds from the works of James Cameron, Andy Weir and George Lucas. Take a look. James Cameron's Avatar (2009) is set on Pandora, a lush, habitable and fictional moon that orbits a gas giant in the very real Alpha Centauri A, which is part of a triple-star system 4.3 light years away from Earth. This August, NASA astronomers peering through the James Webb Space Telescope found that a gas giant about the size of Saturn does indeed orbit Alpha Centauri A. Because of its proximity, and the fact that we recognised it as a binary star system as far back as the 1600s, Alpha Centauri has featured prominently in science-fiction. In Isaac Asimov short stories of the 1940s, humans use...