New research suggests the moons of Jupiter and Uranus may hint that our planetary neighborhood once had a third ice giant.An illustration of Uranus and its five largest moons, Miranda, Ariel, Umbriel, Titania and Oberon. In an alternate timeline, Uranus without any moon friends.
A 'lost planet' may have given Jupiter and Uranus their moons
Written on 05/29/2026
Kiona N. Smith
