WASP-121b, also known as Tylos, is a giant, ultra-hot, gaseous planet located 858 light years from Earth. It's hot because it ...

Sizzling exoplanets have been found before, but WASP-121b continues to surprise astronomers. In 2017, they discovered a water vapor atmosphere that glowed because it was so hot.

WASP-121b is an ultra-hot giant planet that orbits its host star at a distance of only about twice the star's diameter, completing one orbit in approximately 30.5 hours.

WASP-121b is massive — nearly twice the size of our Jupiter. And because it orbits much closer to its host star than Mercury orbits around the Sun, its atmosphere heats up to more than 4,500 ...

WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these "toasted marshmallow" planets could be more complicated than thought.

But because WASP-121b is an ultra-hot Jupiter with extreme temperatures, both materials are vaporized into the atmosphere and are detectable with the high spectral resolution of IGRINS.

The exoplanet WASP-121b, which resides about 900 light-years from Earth, is an egg-shaped scorcher. Temperatures on the planet's day side can reach up to 4,600 degrees Fahrenheit.

If WASP-121b were any closer to its host star, it would be ripped apart by the star’s gravity. The top of the planet’s atmosphere is heated to 2,500 degrees Celsius – so hot that iron can ...

WASP-121b is an ultra-hot giant planet that orbits its host star at a distance only about twice the star's diameter, completing one orbit in approximately 30.5 hours.

If WASP-121b were any closer to its host star, it would be ripped apart by the star’s gravity. The top of the planet’s atmosphere is heated to 2,500 degrees Celsius – so hot that iron can ...

WASP-121b is an ultra-hot giant planet that orbits its host star at a distance of only about twice the star's diameter, completing one orbit in approximately 30.5 hours.

Sizzling exoplanets have been found before, but WASP-121b continues to surprise astronomers. In 2017, they discovered a water vapor atmosphere that glowed because it was so hot.