To be honest, I don't know if anyone has a
concrete answer. I've heard some estimates, but
there are too many of them to actually count each
one. I believe the asteroid belt between Mars
and Jupiter has more than 100,000 asteroids.
And there's much more outside our solar system.
I don't think it's possible to answer that,
because the smaller asteroids are, the harder they
are to see, and the more common they are. Do
grains of dust count as asteroids? If they do,
then the number is unimaginably huge.
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