Quote:

Originally Posted by

Megaton in this context is

I have not taken a physics course in awhile but using E = 1/2MV^2, and the Discovery News velocity estimate of 35 miles/s (~54km/s) the estimate of 20 billion megatons gives a mass of 5.7 * 10^10 metric tons or 57 billion tons.

For comparison that puts it over half the mass of the moon. If I did the math correctly (which I cannot say for sure that I did) that makes me a bit skeptical of the estimate.

Edited for clarity.

**BenC**Megaton in this context is

*energy*not mass. So a that means an energy release of 8.4 x 10^22 J.I have not taken a physics course in awhile but using E = 1/2MV^2, and the Discovery News velocity estimate of 35 miles/s (~54km/s) the estimate of 20 billion megatons gives a mass of 5.7 * 10^10 metric tons or 57 billion tons.

For comparison that puts it over half the mass of the moon. If I did the math correctly (which I cannot say for sure that I did) that makes me a bit skeptical of the estimate.

Edited for clarity.

Quote:

Originally Posted by

Actually, it might start Terra forming on its own. Comets equates to massive amounts of ice. The following impact will grossly expand greenhouse gas + carbon dioxide and primordial soup, could potentially make it hospitable to plants if we ever launched some over there.

**RagingCain**Actually, it might start Terra forming on its own. Comets equates to massive amounts of ice. The following impact will grossly expand greenhouse gas + carbon dioxide and primordial soup, could potentially make it hospitable to plants if we ever launched some over there.

The megaton of TNT is a unit of energy equal to 4.184 petajoules.[1] So 4.184 * 10^15 Joules per megaton, which means 20*10^9 * 4.184 * 10^15 = 8.368*10^25 Joules.

Now converting to mass

8.368*10^25 = (1/2)*m*v^2

2*8.368*10^25 / v^2 = m

Assuming the rate of 54km/s

5.739369 * 10^22 kg

You're right, this is about equivalent to an object 75% the size of the moon crashing into mars at 54 km/s. This is probably enough to obliterate mars into several pieces if its true.