This exoplanet is inflated like a balloon

(CNN)A newly discovered exoplanet 124 light-years away is just full of hot air, according to a new study.

HAT-P-11b, about the size of Neptune and four times larger than Earth, was found in the Cygnus constellation.
The planet is considered a "warm Neptune," with an average temperature of 1,022 degrees Fahrenheit. For reference, Neptune is the farthest planet in our solar system from the sun, making it one of the coldest, and its average temperature is negative 353 degrees Fahrenheit.
HAT-P-11b is 20 times closer to its star than Earth is to the sun. Its atmosphere is full of helium, swollen like an inflated balloon. And much like a balloon caught in the wind, helium is escaping from the atmosphere in an extended cloud.
    Helium, although rare on Earth, is the second most common element in the universe after hydrogen. It's present in Jupiter and Saturn and is widely thought to be detectable in the atmospheres of exoplanets. But it was only found in the atmosphere of a gas giant exoplanet called WASP-107b this year. The helium itself was hard to detect because the infrared signature of the element is out of the range for instruments used.
    Now, for the first time, scientists were able to have detailed observation of how helium is escaping from this gaseous exoplanet's atmosphere. The study was published Thursday in the journal Science.