The Futuristic Invisible Wall That Was Supposed to Protect Entire Towns From Missiles in 1959

When you hear about the concept of missile defense in space, your first thought might be Ronald Reagan’s Strategic Defense Initiative, more commonly called Star Wars. But ideas for an invisible missile shield in the sky are much older than the 1980s. As just one example, we have this Sunday comic strip from 1959,…

How Fighter Jets Lock On (and How the Targets Know)

The primary technology that a military aircraft uses to lock and track an enemy aircraft is its onboard radar. Aircraft radars typically have two modes: search and track. In search mode, the radar sweeps a radio beam across the sky in a zig-zag pattern. When the radio beam is reflected by a target aircraft, an…