What lurks at the center of a black hole? Studying the space-time ripples from black hole collisions could reveal an answer.
Black holes are some of the most enigmatic objects in the universe. This is partially because the equations of general relativity that we use to understand them break down when studying black holes' ultra-dense centers. However, a new paper shows how astronomers could one day overcome this challenge by using gravitational waves to"see" inside merging black holes, and learn what they're really made of.
We do not yet have any complete quantum theory of gravity, but we do have several candidates. For example, there's string theory, which predicts that all particles in the universe are actually made of ultra-tiny vibrating strings. There's also loop quantum gravity, which says that space-time itself is made of tiny, indivisible chunks like pixels on a computer screen.
Gravitational microscopesBlack hole mysteryWith the nearest known black holes thousands of light-years away, it's hard to test these models. But occasionally black holes send us crucial information, especially when they merge together. When they do, they release floods of gravitational waves, which are ripples in space-time that can be detected with sensitive instruments on Earth, like the Laser Interferometer Gravitational-Wave Observatory and VIRGO experiments.
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