👉 "Ultraterrestrial," often referred to as "ultra-" or "terrestrial," is a specific type of celestial body that has been observed and studied by astronomers for thousands of years. Ultraterrestrial refers to objects in our solar system that are significantly larger than Earth but smaller than the planets, moons, asteroids, and comets we orbit around. These objects are thought to be composed primarily of rock, metal, or ice, with some evidence suggesting liquid water exists. Ultrater