How hot is Neptune?

Unlike the terrestrial planets, Neptune and the other gas giants still hold much of the atmosphere they had at their formation. Temperature and pressure shift at different heights. The average temperature at the top of the cloud tops is minus 346 degrees Fahrenheit (minus 210 degrees Celsius). read more

Neptune's temperature is driven more by the motions within its interior than by the rays of the sun, motions that Uranus doesn't seem to share. The long summer Like other planets on the solar system, Neptune doesn't sit completely parallel to the sun. read more

But as with all gas and ice giants, temperatures vary on Neptune due to depth and pressure. In short, the deeper one goes into Neptune, the hotter it becomes. At its core, Neptune reaches temperatures of up to 7273 K (7000 °C; 12632 °F), which is comparable to the surface of the Sun. read more

A hot Neptune or Hoptune is a type of giant planet with a mass similar to that of Uranus or Neptune orbiting close to its star, normally within less than 1 AU. The first hot Neptune to be discovered with certainty was Gliese 436 b in 2007, an exoplanet about 33 light years away. read more