My pal Veronica Belmont hosts a show on TechFeed called Fact or Fictional, where she investigates the science of a movie based on viewer suggestions. She recently took on the
wonderful fantastic gawd-awful piece of festering offal "Armageddon", talking to scientist Joe Hanson, who writes the terrific It’s OK to Be Smart blog.
Let’s just say they agree with me about the movie:
If you want to learn how we’d really prevent an asteroid impact, and why we need to take this seriously, I gave a TEDxBoulder talk about it. It’s a real threat, but one we can prevent if we choose to do so.
I do so love to make fun of the movie "Armageddon". I know, it’s such an easy target, but still.
I talk about the movie when I give public lectures about asteroid impacts, because a lot of people have seen it – so it’s a nice common point of contact – and because it really goes out of its way to get so much stuff wrong.
The premise of the movie is that a giant asteroid is going to hit the Earth and wipe out all life. I’ll skip a vast amount of silliness and get to the thing that really made me laugh out loud when I first saw the flick: to prevent the impact, astronauts plant a nuclear bomb below the surface and detonate it. This splits the asteroid in half, and (SPOILER ALERT!) the two pieces are flung apart at sufficient velocity that they pass our planet on either side, missing us, and the world is saved!
Well, not so much. I saw the movie when it came out in 1998, and after I got home from the theater – and after the Tylenol kicked in – I did a little math. We know how big the asteroid is, and what it’s made of – that gives us the mass (and therefore the mass of each half after it’s split). We also know how rapidly it’s approaching the Earth, and how far it was from the Earth when the bomb went off. That then can be used to figure out how fast the two halves separated (they had to separate by at least the Earth’s diameter to miss us).
An object in motion has energy, called kinetic energy. It depends on the mass of the object and its velocity – the more massive it is, or the faster it moves, the more kinetic energy it has. In the case of the Armageddon asteroid, the two halves got their kinetic energy from the bomb, so by calculating the kinetic energy of each piece you can find the explosive yield of the bomb.
I did that. The bomb would have exploded with roughly the same energy output as the Sun. In other words, it would have been a 100 billion megaton bomb. Yikes.