this post was submitted on 26 Sep 2026
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No Stupid Questions
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Hopefully if were at the point of being able to haul massive asteroids back to earth, we also have the technology to intercept it and move it, or destroy it, and we have that capability ready on demand.
Hopefully, but we're not a very forward-thinking species. More likely we'd only give haulers just enough fuel to make gravity-assisted trips (which are only possible when orbits match up optimally) because it's cheaper that way, making on-demand interception unlikely.
Destruction doesn't always work either. If it's struck close to Earth most of the fragments will still hit, and even if they're too small to survive reentry they will still dump tons of heat energy into the atmosphere.
Physics is a harsh mistress.
I wonder how much heat energy fragments would actually dump and if it would be statistically significant. Somebody do the math!
I couldn't find any hard values, but Wikipedia does have a chart displaying the energy asteroids of various sizes would release if they exploded before hitting the ground, as well as the total kinetic energy they'd have upon hitting atmosphere. All that energy would still have to go somewhere even if it's fragmented.
I also found that a single 50 meter fragment is enough to destroy an entire city and surrounding metropolitan area, so even if the heat isn't an issue you'd still have to somehow ensure zero large fragments survive interception.
Oh no I don't think we would. Once an asteroid is earth bound and past its apoapsis there is very little you can do (even with near infinite propulsion) to make it not collide with the earth.
Destroying it turns one big problem into a billion small problems with the same velocity and trajectory, which is also a no win scenario.