Some of the most violent cosmic collisions occur silently in the vacuum of space, but with the right instrumental ears, we can still hear it happen. Here's how.
Some of the most violent cosmic collisions occur silently in the vacuum of space, but with the right instrumental ears, we can still hear it happen. Here's how.When two black holes slam together, they don’t make a sound. And yet, this is what we hear if we listen closely.That “chirp” is what we heard from two black holes that slammed together about a billion light-years from Earth. The tone rises as they spiral closer together, and abruptly stops when they merge.
Recorded, analyzed, and converted to sound, each one’s jostling of spacetime becomes its own distinctive, data-rich “chirp.”That long, low buildup is a sign of a slower, more sedate merger from relatively lightweight in-spiraling black holes.is a sign of a faster merger of heavier black holes…Now, after a long hiatus for upgrades and the COVID pandemic, theGravitational wave observatories don’t have mirrors or lenses like normal telescopes.
Shorten the laser and just like a violin string, you get a higher pitch. Lengthen it and you get a lower pitch. Convert all this laser vibrato to sound, and you can even hear black holes collide with a “chirp.” Cross-checking between these observatories confirms each event is more than random noise; if the same ripples appear in each one, they must come from somewhere in the sky.
If astronomers get lucky enough to detect both gravitational waves and light from some celestial smash-up as happened in 2017 with a neutron-star merger called GW170817.
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