They just look like big black triangles and don’t seem to have any fins or guidance systems so how do they travel across thousands of kilometres and hit different targets from the upper atmosphere?
In: Engineering
They’re aerodynamically stable at hypersonic speeds, and they re-enter the atmosphere so fast that after they’re released from the upper bus (which is itself a liquid-fuelled rocket powered spacecraft that can manouver and orient everything correctly before releasing each individual MIRV) the amount of time they actually spend in the atmosphere, and thus the amount they get deflected, is both trivial and very easy to correct. It’s basically like throwing a dart accurately at that point.
Bear in mind that modern MIRV’s, quite unlike normal reentry vehicles such as the space shuttle, are specifically designed NOT to be blunt-body, which means they actually do not slow down all that much as they go through the atmosphere. This makes them get amazingly, incredibly hot, but they’re designed to hack that.
Manouverable vehicles like MARVs and hypersonic glide vehicles are a bit different
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