The Universe is defined as the summation of all particles and energy that exist and the space-time in which all events occur. Very little is known about the size of the universe. It may be trillions of light years across, or even infinite in size.

Now we found the hole is nearly a billion light-years across. It is not a black hole, which is a small sphere of densely packed matter. Rather, this one is mostly devoid of stars, gas and other normal matter, and it's also strangely empty of the mysterious "dark matter" that permeates the cosmos. Other space voids have been found before, but nothing on this scale.

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