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This is Scientific American's 60-second science. I'm Christopher in Talata. Got a minute?

Every day, 100 tons of space dust rain down on the Earth's atmosphere.

By night, we know this material as shooting stars, and our neighbor the moon is likewise exposed to that debris,

but without an atmosphere to stop it.

So all those particles strike the moon's surface at 12 miles per second, like tiny bullets.

And each impact kicks up a thousand times its weight in moon dust.

Mihai Hirani, a physicist at the University of Colorado, makes this analogy.

Imagine that you are making pasta and there is a flower on the table and you get unpatient

and upset and you smack the table.

There is going to be a whole cloud of tiny particles, you know, flying off the table.

Arani and his colleagues sampled that cloud of particles with NASA's lunar atmosphere and dust

environment explorer,

or Laddie, as it orbited the moon slurping up dust.

Judging by the shape and density of the cloud, the scientists say the particles striking

the moon and kicking up that cloud must be mostly high-speed comet grains, rather than slower

bits of asteroid. And as you might expect, the moon's halo of dust

increases during heavy bombardment, the same time that we have meteor showers here on Earth.

...