The computer modeling tools we use on the spectra and atmospheres of gas giant planets today are the same kind of tools we will use to interpret the spectra of potential exo-Earths in the future ...

The exoplanet, WASP-69 b, is a gas giant. It's around the same size ... tail extends at least seven times the radius of the giant [exo]planet itself." Related: 32 alien planets that really exist ...