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Asked by to Nat, Nate, Roberto, Sam, Sarah on 18 Jun 2014. This question was also asked by .
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Sarah Casewell answered on 18 Jun 2014:
That’s tough – I think the biggest things are galaxies which can contain billions of stars and have a massive black hole at their centre.
The biggest single things though are either massive stars which can have 100-200 times the mass of the sun. Or enormous gas clouds that form stars. (It depends on whether you think a cloud is one thing or not!)
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Nate Bastian answered on 18 Jun 2014:
Probably the largest “things” (depending on how you define things) in the Universe are “super-clusters” of galaxies. The Milky Way (our galaxy) belongs to a relatively small group of about 30 galaxies. Super-clusters are made up of thousands of these small (and sometimes much larger) groups. The extend over millions of light-years.
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Natasha Stephen answered on 18 Jun 2014:
The Universe itself is quite possibly infinite so I guess the largest things within them are galaxies or galaxy-clusters; these contain billions of stars that may in turn have billions of planets orbiting them…
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Roberto Trotta answered on 19 Jun 2014:
Superclusters of galaxies are the biggest structures in the Universe. They are made of thousands of galaxies and stretch for million of light years.
Many stars bound together by gravity form a galaxy – many galaxies together form a cluster – and many clusters together form a supercluster.
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Sam Connolly answered on 19 Jun 2014:
The biggest single things in the universe (not made up of separate bits) are supermassive black holes, which makes sense as they’re also the heaviest! The biggest know supermassive black hole is about ten billion times heavier than the sun (which means its weight in kilograms is a one with 40 zeroes after it!) and is about 1,000,000,000,000,000 times bigger! (that’s a quadrillion times bigger!). That means its surface would be 200 hundred times further out than Pluto!
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