Asteroids constantly zoom around our solar system and sometimes smash into planets, including Earth. As such, in the name of planetary defense NASA conducted a test, dubbed DART (Double Asteroid Redirection Test), to deflect a space rock like the one that wiped out the dinosaurs (or the one Bruce Willis blew up at the end of the movie Armageddon).
Not all asteroids are planet killers, however. While some are monster-size, others are quite tiny. So, what are the largest and smallest asteroids on record in the solar system?
In short, the largest asteroid in the solar system is Ceres, which at nearly 590 miles (950 kilometers) across is about one-quarter the size of the moon. The smallest asteroid is more difficult to pin down; the smallest asteroid officially recognized by NASA (opens in new tab), known as asteroid 2015 TC25, is 6 feet (2 meters) across. Some definitions purport that asteroids must be at least 3 feet (1 m) across(opens in new tab), but not all scientists agree about this size limitation.
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