Hot Jupiters are Too Hot for Water to Handle

Exoplanets known as ultra-hot Jupiters (because of their extreme temperature and size) seem to lack water vapor. Astronomers didn’t know why until an August paper in Astronomy & Astrophysics showed that the worlds’ atmospheres are just too darn hot, tearing apart any water molecules shortly after they form. The finding further blurs the line between exoplanets and stars.