What's the Most Massive Object in the Universe?
There's nothing like staring up at the night sky to make you feel small.
But when looking out into the cosmos, you might also wonder: What is the most massive known object in the universe?
In some ways, the question depends on what is meant by the word "object." Astronomers have spotted structures like the Hercules-Corona Borealis Great Wall — a colossal filament of gas, dust and dark matter containing billions of galaxies that stretches for about 10 billion light-years in length — which could contend for the title of biggest object ever. But classifying this assembly as a unique object is problematic because it's hard to figure out exactly where it begins and ends.
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