What is the least known asteroid? What about the biggest one?

Asteroids constantly zoom around our solar system and sometimes smash into planets, including Earth. So, in the name of planetary protection NASA tested, called DART (Double Redirected Asteroid Test), to deflect a space rock like the one that wiped out the dinosaurs (or the one that Bruce Willis blew up at the end of the movie Armageddon).

Not all asteroids are planet killers, however. While some are monstrous, others are tiny. So what are the biggest and the smallest asteroids on record in the solar system?

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