Скачать или смотреть The Threat That Doesn't Leave a Crater

We're familiar with asteroid impacts - solid rocky bodies from the asteroid belt that create craters like the one in Arizona.
But comets are different. They're born at the edge of the solar system in regions of ice with densities as low as 0.01 - incredibly porous, traveling at speeds up to 50 kilometers per second.
When a comet encounters Earth's atmosphere - which is 1,000 times denser than its own structure - it can't penetrate. The atmosphere is impenetrable to something that porous.
So it decelerates rapidly. All that kinetic energy converts to heat. The result is an airburst - a massive atmospheric explosion before it ever reaches the ground.
No crater. But catastrophic effects - thermal pulse, shockwave, fires across vast areas.
That's what makes comets so dangerous. You won't necessarily see evidence on the ground. The devastation happens in the air.

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