What Aliens Would Hear If They Listened to Earth

Right now, Earth is leaking. For about a hundred years, our planet has been pouring radio, TV and radar signals into space, day and night. So imagine an alien astronomer 50 light-years away, pointing a giant radio telescope at our Sun. What would they actually hear? Our music? Our movies? Our languages? The real answer is much stranger. In this video we follow Earth's signals into space — from the first radio broadcast in 1920 to Cold War radars, the Arecibo message and the Voyager Golden Record — and discover why, from far away, Earth might soon sound like a planet that's gone extinct. ⏱ Chapters 0:00 Earth is leaking 0:44 The bubble of human noise 1:48 The problem: our signals are too weak 2:37 Loud signal #1: old television 3:03 How aliens could measure our day and year 3:46 Loud signal #2: military radars 4:25 Shouting on purpose: the Arecibo message 5:25 The Voyager Golden Record 6:07 The alien's logbook 6:33 The twist: Earth is getting quieter 7:19 Maybe everyone just got quiet 📚 Sources Sullivan, Brown & Wetherill (1978), Science — "Eavesdropping: The Radio Signature of the Earth" KDKA — one of the first commercial radio broadcasts (November 2, 1920) The Arecibo message — Frank Drake, Carl Sagan and colleagues (November 16, 1974) NASA — the Voyager Golden Record (1977) 💬 If aliens listened to Earth right now — what do you think they'd hear? Tell us in the comments 👇 🔔 Subscribe for more weird questions with real science. #aliens #space #seti #voyager #science #whatif