Uploaded February 2026 | Updated September 2026, 3 days ago
Missile defense is often described as “shooting down a missile with another missile.”
That makes it sound like aiming.
That’s not what actually happens.
Interceptors don’t chase targets the way a fighter jet would. Instead, they exploit geometry. Using a guidance method called proportional navigation, the interceptor continuously adjusts its path to drive the rate of change of the line-of-sight angle to zero.
When the line of sight stops rotating, the interceptor and target are on a constant bearing.
And in physics, a constant bearing means only one thing: collision is inevitable.
In this video, we strip the problem down to its essentials—no tactics, no hype, no classified details. Just motion, angles, and why cancelling geometry is far more reliable than “aiming” at something moving faster than a rifle bullet.
This is why interception can look almost automatic.
And why, in missile defense, math often matters more than firepower.
The Cartoon Guide to Physics by Larry Gonick (Author), Art Huffman (Author) Affiliate Link -- amzn.to/4gPEzxT
Missile defense is often described as “shooting down a missile with another missile.”
That makes it sound like aiming.
That’s not what actually happens.
Interceptors don’t chase targets the way a fighter jet would. Instead, they exploit geometry. Using a guidance method called proportional navigation, the interceptor continuously adjusts its path to drive the rate of change of the line-of-sight angle to zero.
When the line of sight stops rotating, the interceptor and target are on a constant bearing.
And in physics, a constant bearing means only one thing: collision is inevitable.
In this video, we strip the problem down to its essentials—no tactics, no hype, no classified details. Just motion, angles, and why cancelling geometry is far more reliable than “aiming” at something moving faster than a rifle bullet.
This is why interception can look almost automatic.
And why, in missile defense, math often matters more than firepower.
The Cartoon Guide to Physics by Larry Gonick (Author), Art Huffman (Author) Affiliate Link -- amzn.to/4gPEzxT
