In the asteroid belt around the sun there are over 1 million asteroids 1km or bigger in diameter. That would seem to imply a lot of collective mass in all of these asteroids, right? So how do they compare to more familiar celestial bodies in our solar system? This science blog explains:
“While the combined mass of every asteroid is just 4% the mass of our Moon, Ceres and Vesta alone are estimated to make up nearly 40% of the mass of the entire belt.”
Just 4% of our moon in total? This means each asteroid is miniscule, relatively speaking. This makes you wonder too, if we ever start mining in space, why mess around chasing down distant asteroids? Just go to the moon for nearby one-stop shopping. (See pros and cons of mining the moon vs. asteroids here.)
The video below shows awesome close ups of Vesta.