Astronomers have been able to “hear” the celestial hum of powerful gravitational waves, created by collisions between black holes, echoing across the universe for the first time.
Their observations reveal that the waves — including some that slowly undulate as they pass through our Milky Way galaxy — occur at different frequencies and oscillate for decades. The discovery could help scientists better understand cosmic phenomena like supermassive black holes and how often galaxies merge. Gravitational waves, initially predicted by Albert Einstein in 1916, are ripples in space-time that were first detected in 2015.
“We’re using a gravitational-wave detector the size of the galaxy that’s made out of exotic stars , which just blows my mind,” said study coauthor Dr. Scott Ransom, staff astronomer at the National Radio Astronomy Observatory, in a statement. “Our earlier data told us that we were hearing something, but we didn’t know what. Now we know that it’s music coming from the gravitational universe.
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