NASA used the Hubble e Spitzer space telescopes to study the composition of the atmosphere of Gliese 3470 b, a mini-Neptune that orbits very close to its star, which is a red dwarf but still heats it up to temperatures that are estimated on the surface between 700 and 900 Kelvin. Gaseous planets have an atmosphere composed mainly of hydrogen and helium but normally there are also other heavier elements, with the consequence that various molecules can form, but in Gliese 3470 b those elements are really scarce.