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Two giant planets collided and astronomers caught the explosion 1,800 light years away

It’s a bit mind-boggling to imagine something as big as the planet Neptune crashing into a similar-sized planet, but astronomers caught this exact scenario, as described in a recent study in the journal Nature. A pair of ice giants — or massive planets the size of Uranus and Neptune, but composed of elements that are heavier than hydrogen and helium — collided into each other as they passed in front of the star they orbit, ASASSN-21qj....

Originally posted on salon.com