Are you using explosives to make the crater in Comet Tempel 1?
There is no bomb nor explosives on our spacecraft. When the impactor hits the comet, it forms the crater simply from the transfer of kinetic energy. For example, 2 cars traveling very slowly only get crunched a little when they hit, but two cars traveling very fast can get demolished upon impact. Same thing with Deep Impact’s impactor and the comet, they are both traveling very fast (faster than cars, faster than bullets) so the crunch they make is enough to carve out a good-sized crater on the comet without using explosives.
