[Salgak]

Let's see. . . rock is roughly 4KM in diameter. Assume a mostly iron composition: Iron is 7874 kg/m^3. Assume roughly spherical shape: that gives you roughly 270 billion cubic meters of iron. The math gives you a bit over 2 billion metric tons of iron with a total relative velocity difference of roughly 50 meters a second. That's 5.25 quintillion joules of energy. That's a BIG bang. . . .

[Soren]

Doesn't 4km diameter imply 4/3 2km ^ 3 = 10.66 km3 or about 11B cubic meters, or I am stuck in an alternate dimension again?