How Sound Helped Find a Space Rock Over Alaska ⚡ экспресс
On April 24, 2025, a brilliant fireball flew over Alaska. Dozens of ground sensors picked up the earth and air vibrations, precisely tracing the trajectory and power of the event. It's like a forest that 'detects' a passing object by the rustle of leaves. In the Arctic, where satellites often can't see, these networks prove indispensable. The Earth can 'hear' space better than the sky!
On April 24, 2025, a celestial drum boomed over Alaska. Sunlight outshone the flash, and satellites missed the meteor. But the earth and air acted like a giant percussion instrument: dozens of ground microphones picked up a low rumble, and vibration sensors detected tremors. This provided a precise 'melody' of its flight.
The shockwave from the fast rock (25 km/s) made the air resonate like a membrane, and the ground vibrate like a drum body. A network of sensors, originally designed for monitoring nuclear tests, helped calculate the size (70 cm) and energy (38 tons of TNT) of the uninvited guest. It turned out to be an ordinary stony chondrite of type L.
The method is cheap and unafraid of polar day. Now ground-based 'ears' will become a reliable complement to satellite 'eyes' for protection against cosmic intruders.
🎯 The meteor left a whopping 30 shockwaves—like throwing one stone into water sends out dozens of ripples, but here the ripples also traveled through the earth's depths.