> From: "Eric Walker" <[email protected]>
> To: [email protected]
> Sent: Friday, November 16, 2012 10:52:24 PM
> Subject: [Vo]:what if a diamond meteor hit the earth at the speed of light?

> "If a meteor made out of diamond and 100 feet in diameter was
> traveling at the speed of light and hit the earth, what would happen
> to it?”
> 
> —Aidan Smith, Age 8, via his father Jeff

Strictly speaking, anything AT the speed of light will have infinite mass. 

A diamond NOT in oxygen, and/or (?)  at high pressures can survive heat up to 
at least 3000C -- but it will burn in oxygen at 750C.

But I think it would make it through the atmosphere pretty much intact.

On impact a diamond will shatter ... so I suspect you would get a relatively 
shallow crater compared to regular meteorites.

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