The universe is a vast void, mostly made up of an eerie, empty vacuum. In spite of all this emptiness, there are regions that contain enormous structures. For example, our Sun is a ginormous compilation of gas and dust. And even greater than our Sun are magnificent structures such as planetary nebulae, entire galaxies and galaxy clusters. But which structure in the universe trumps all the rest in size? It turns out that it’s something mysterious, and its existence defies the laws of physics.
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