They blew the asteroid up with a nuke in the upper atmosphere. Just one nuke (actually, the original fatman nuke). Sure, not possible, but back in 1995 they obviously thought so.

I disagree that it wasn't a good show; if it wasn't, it wouldn't have lasted as long as it did. Sure, it had it's down points, but it was good until the star and his brother (who joined a few years in) left the show. Then it went to the pits.
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I just wish Hollywood would really stop looting other stuff. They are the Roman Empire of Film!!- Canadian Pitbull, on Hollywood's obsession with remakes