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On the basis of extensive calculations and models, astronomers in the 1990s predicted that the collision of two neutron stars or a neutron star and a black hole could release a massive burst of gamma rays in an event called a kilonova. This ______ was confirmed with observations in 2017.

24 Mar

On the basis of extensive calculations and models, astronomers in the 1990s predicted that the collision of two neutron stars or a neutron star and a black hole could release a massive burst of gamma rays in an event called a kilonova. This ______ was confirmed with observations in 2017.

Which choice completes the text with the most logical and precise word or phrase?

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