You can't give a single answer to "how much does an asteroid weigh?" because asteroids come in a HUGE range of sizes.

Here's why:

* Size matters: Asteroids range from small pebbles to objects hundreds of kilometers across. The bigger the asteroid, the heavier it is.

* Density varies: Asteroids are made of different materials (rock, metal, ice), and their density can vary.

* We don't know everything: We haven't measured the mass of every asteroid, and some are very difficult to study.

Here's an analogy: Imagine you ask, "How much does a rock weigh?" The answer is... it depends! A pebble weighs very little, but a boulder is much heavier.

Instead of asking "how much does an asteroid weigh?", think about these things:

* How big is the asteroid?

* What is it made of?

Then, we can start to make estimates!