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Scientists have fun a decade of listening to black holes : NPR

September 12, 2025
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Scientists have fun a decade of listening to black holes : NPR
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Researchers have spent 10 years bettering the large detectors they use to catch shockwaves from colliding black holes. Now the science is exact sufficient to check one in all Stephen Hawking’s key concepts.



JUANA SUMMERS, HOST:

Black holes are among the most excessive mysterious objects within the universe. And when two black holes collide, shockwaves get despatched out by means of the very cloth of house. This weekend, scientists are celebrating the tenth anniversary of the primary time they ever detected these waves. And as NPR’s Nell Greenfieldboyce reviews, they’ve gotten so good at measuring them, they’ve simply been in a position to take a look at a key thought about black holes first proposed by physicist Stephen Hawking.

NELL GREENFIELDBOYCE, BYLINE: These waves are referred to as gravitational waves. They’re just like the ripples in a pond once you throw in a pebble. Max Isi is an astrophysicist at Columbia College. He says the waves transfer by means of all the pieces – the Earth, even our personal our bodies – stretching and squeezing distances.

MAX ISI: At one second it makes me taller and thinner. The subsequent second it makes me shorter and fatter.

GREENFIELDBOYCE: That is imperceptible to us, in fact. Isi says that Albert Einstein, who proposed the existence of those waves, thought they’d by no means be detected.

ISI: Simply because it sounded ludicrous. So I am certain that if we advised him that we’re detecting gravitational waves from colliding black holes each two or three days or so, it will have been mind-blowing to him.

GREENFIELDBOYCE: But that’s simply what researchers have been doing lately, with two monumental detectors often known as LIGO. One is in Washington state. The opposite is in Louisiana. These amenities ship lasers down 2 1/2-mile tubes to detect the tiny squeeze and stretch that happens when a gravitational wave rolls by means of. Their first detection was again on September 14, 2015. The waves got here from two black holes that circled one another after which merged.

Gabriela Gonzalez is a gravitational wave researcher with Louisiana State College. She says they initially anticipated LIGO would sense a bunch of maximum cosmic occasions aside from black gap collisions.

GABRIELA GONZALEZ: However since then, it is nearly the one factor we now have seen.

GREENFIELDBOYCE: A whole lot of pairs of colliding black holes have been registered by the LIGO detectors. Katerina Chatziioannou is a physicist at Caltech. She says earlier this 12 months, they logged the strongest sign to this point – two black holes, every about 30 instances the mass of the solar, merging collectively about 1.3 billion light-years from Earth.

KATERINA CHATZIIOANNOU: It appears similar to the black holes that created the primary sign 10 years in the past.

GREENFIELDBOYCE: What’s totally different now’s that over time, LIGO’s gear has been upgraded and improved.

CHATZIIOANNOU: As a result of the detectors are so a lot better right now, we are able to report the sign a lot extra clearly.

GREENFIELDBOYCE: That allow them take a look at some main theories about black holes, like a well-known prediction that Stephen Hawking made in 1971 in regards to the space of a black gap.

CHATZIIOANNOU: Which says that the occasion horizon of a black gap – the area past which nothing can escape from the black gap – solely grows with time.

GREENFIELDBOYCE: That is precisely what they noticed after they analyzed this specific burst of gravitational waves. Max Isi says, to him, it is actually hanging.

ISI: All of those concepts that folks had thought up within the ’70s, pondering it was simply idle hypothesis, now they’re manifested in precise approach that we see this stuff occurring.

GREENFIELDBOYCE: Gravitational wave researchers have plans for the following 10 years. They need larger and extra highly effective detectors, assuming they will get the cash to construct them. Funding for the present detectors is presently beneath risk, with the Trump administration proposing steep cuts for 2026.

Nell Greenfieldboyce, NPR Information.

(SOUNDBITE OF MUSIC)

Copyright © 2025 NPR. All rights reserved. Go to our web site phrases of use and permissions pages at www.npr.org for additional info.

Accuracy and availability of NPR transcripts might differ. Transcript textual content could also be revised to right errors or match updates to audio. Audio on npr.org could also be edited after its unique broadcast or publication. The authoritative report of NPR’s programming is the audio report.



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