Once the Solar System's Ninth Planet, Pluto Was Reclassified 20 Years Ago. Here's Why Planetary Scientists and the Public Alike Love the Small Icy Body
When scientists announced Webb’s first definitive detection of Neptune’s auroras in March 2025, they revealed another surprise: observations taken in 2023 showed that the planet’s upper atmosphere had cooled by several hundred degrees since Voyager 2 visited in 1989—and scientists still don’t know exactly why.