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Home Planets having atmospheres rich in helium may be common in our galaxy, according to a new theory based on data from NASA’s Spitzer Space Telescope. (NASA/JPL-Caltech) Planets having atmospheres rich in helium may be common in our galaxy, according to a new theory based on data from NASA's Spitzer Space Telescope. (NASA/JPL-Caltech)

Planets having atmospheres rich in helium may be common in our galaxy, according to a new theory based on data from NASA’s Spitzer Space Telescope. (NASA/JPL-Caltech)

Planets having atmospheres rich in helium may be common in our galaxy, according to a new theory based on data from NASA's Spitzer Space Telescope. (NASA/JPL-Caltech)

Planets having atmospheres rich in helium may be common in our galaxy, according to a new theory based on data from NASA’s Spitzer Space Telescope. (NASA/JPL-Caltech)