Uranium and Thorium do most likely exist in other planets in our solar system and some of the moons of Jupiter and Saturn. But on the asteroid belt the likelihood is slim to none.

Is there any uranium in space?

In space Uranium is formed naturally occurring in supernovas. However since we can't even travel to the nearest star it is just a minor fact. ... Uranium can be found as part of a lot of different minerals such as uranite. The element rarely occurs in its pure form.

What planet has uranium?

Uranium was named after the planet Uranus, which had been discovered eight years prior to the discovery of uranium. Uranus was named in honour of the Greek god of the sky.