Deep Impact coincided with Armageddon, a similarly themed movie about the effort to stop an asteroid which is, absurdly, "the size of Texas": more than 100 times bigger than the K-T object. "It's what we call a global killer," Billy Bob Thornton's Nasa executive tells the president. "The end of mankind. Doesn't matter where it hits, nothing would survive, not even bacteria." It sounds like a brag.