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Does anyone know...
 
#2
Not that I know of. Here's a quick shot at it:

30 million cubic kilometres of ice. 30 million million cubic meters of ice. Each of those cubic meters of ice contains about 900kg of ice/water. The energy required to melt 1kg of ice already at zero degrees is 334kJ (If I remembering my physics right.). Then heat that up to a hundred degrees celsius (4181.3 J*100).... then boil it all to vapour (1371 kJ).

So, if I 'm doing this right it takes 419835 Joules of energy to go from 1kg of ice a 0 Celsius, to 1kg of water vapour at 100 degrees.

Multiply by 900 to get the energy required to convert a cubic meter of ice into steam. 377851500J That's a big enough number.

Multiply that by a million. Then by a million. Then by thirty. 1.2595*10^19 Joules. (If my text-box wikipedian maths are right. I can dig up my college thermo notes to make certain).

And that's just to heat the antarctic ice sheet from 0 degrees, up to 100 and boil it. You don't even have to boil... just melt it. (Giving 1.2554*10^19)

Compare with the Dinosaur Killer which, wikipedia-fu suggests was about 4×10^23 Joules of energy. The result's actually less insane than I expected. But not all that energy goes into vapourising the ice, there's gigatons of rock that have to be excavated to to form our crater, debris has to be blasted into orbit. And not included is the massive kinetic energy required to shift the Earth's axis by a couple of degrees.

That takes something the size of the moon.

Come to think of it. The coverstory was that it was a 5cm pebble screaming in at about 95% the speed of light. The kinetic energy of that is only ever going to be in the vicinity of x*10^16 Joules.... even taking into account relativity. Since a 5cm pebble is going to weigh less than a kilogram..... it doesn't come close.

Edit: Unless it was made of something hyperdense like a chunk of a neutron star or something. If it's a neutron star shard this actually makes a lot more sense considering how massively dense they are.... Meanwhile scientists who don't know any better trying to explain how something so small dense could possibly exist.
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Messages In This Thread
Does anyone know... - by Bob Schroeck - 03-16-2012, 02:55 PM
RE: Does anyone know... - by Disruptor - 04-27-2018, 10:49 PM
RE: Does anyone know... - by InsaneTD - 04-28-2018, 12:20 AM
RE: Does anyone know... - by Disruptor - 04-28-2018, 05:52 AM
[No subject] - by Dartz - 03-16-2012, 05:49 PM
[No subject] - by Bob Schroeck - 03-16-2012, 07:50 PM
[No subject] - by Dartz - 03-16-2012, 08:40 PM
[No subject] - by sweno - 03-17-2012, 11:15 AM
[No subject] - by Dartz - 03-17-2012, 11:48 PM
[No subject] - by Dartz - 04-29-2012, 07:51 PM
[No subject] - by Black Aeronaut - 04-30-2012, 12:47 AM
[No subject] - by Jorlem - 04-30-2012, 03:19 AM
[No subject] - by ECSNorway - 04-30-2012, 05:38 PM
[No subject] - by Foxboy - 04-30-2012, 06:39 PM
[No subject] - by Norgarth - 05-01-2012, 07:20 AM
[No subject] - by robkelk - 05-01-2012, 01:36 PM
[No subject] - by Bob Schroeck - 05-01-2012, 04:05 PM
[No subject] - by Norgarth - 05-01-2012, 06:22 PM

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