Question

What is the biggest thing in the universe?

Answer 1

1. The Hercules-Corona Borealis Great Wall is a supercluster of galaxies that scientists have identified as the universe's largest single entity.
2. It is so large that light takes about $10billion$ years to travel across it.
3. The 'Hercules-Corona Borealis Great Wall,' discovered in November 2013, is the largest known structure in the Universe.

Hence, the correct answer is Hercules-Corona Borealis Great Wall.