Alien radio waves could be passing through you right now — and a $100M SETI push is scanning 1M stars and 100 galaxies for technosignatures. Think 500‑ft Green Bank so sensitive it could hear a cell phone on Mars, petabytes of cosmic static, a 72‑second Wow Signal, and the brutal lag: a message from 500 light‑years means 1,000 years per back‑and‑forth.