Asteroidal water is water or water precursor deposits such as hydroxide (OH⁻) that exist in asteroids (i.e., small Solar System bodies (SSSBs) not explicitly in the subcategory of comets). ... Nevertheless, a significant amount of water is also found inside the snow line, including in near-earth objects (NEOs).

How much water is there in asteroids?

A recent study suggested that roughly 1,000 water-rich, or hydrated, asteroids near our planet are easier to reach than the lunar surface is. While most of these space rocks are only a few feet in size, more than 25 of them should be large enough to each provide significant water.

What asteroid has water on it?

The largest asteroid in the solar system seems to have a salty ocean of water sitting deep beneath its surface. Ceres, the largest asteroid in the solar system, seems to have liquid water seeping onto its surface, according to a new paper in Nature Astronomy.