An article published in the journal “Astronomy & Astrophysics” describes a research on gas giant planets very close to their star. A team of researchers used observations made with Hubble and Spitzer space telescopes and computer simulations to study in particular the characteristics of the atmosphere of the exoplanet WASP-121b but also of other similar ones, called ultrahot Jupiters. They’re so close to their stars that their dayside has very high temperatures and are in some ways more similar to a star than a planet.