including Uranus, are hundreds of degrees Kelvin/Celsius above what models predict if only warmed by the sun, leaving us with the big question of how these planets are so much hotter than expected?

A pale blue-green enigma, the planet Uranus has long fascinated astronomers precisely because of its extreme distance, some 1.6 billion miles (2.6 billion km) from Earth. While it is comparatively ...

This image of Uranus’ aurorae was taken by the NASA/ESA Hubble Space Telescope on 10 October 2022. Credit: ESA/Hubble, NASA, L. Lamy, L. Sromovsky Decades of data collected by the Hubble Space ...

A cool mystery The last and only spacecraft to fly past Uranus was Voyager 2 in 1986, on its way out of the solar system. It was able to take the temperature of the upper part of Uranus ...

This image provided by ESA/Hubble shows Uranus' aurorae taken by the NASA/ESA Hubble Space Telescope on Oct. 10, 2022. (ESA/Hubble via AP) 34,155 people played the daily Crossword recently.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. When the Voyager 2 ...

Uranus, the third-largest planet in our solar system, has always been something of an enigma. Now, it seems that our understanding of the planet — garnered mostly from a flyby by a NASA ...