/u/ughaibu's posts in /r/askscience

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Do physicists hold that centres of gravity are physical?

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Are there cosmological theories in which the universe as a whole neither began to exist nor has always existed, but is composed of parts that separately come into and go out of existence?

1 upvotes

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Is it possible for there to be a sphere of uranium (U235) of radius one mile?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Do physicists hold that centres of gravity are physical?	1
Are there cosmological theories in which the universe as a whole neither began to exist nor has always existed, but is composed of parts that separately come into and go out of existence?	1
Is it possible for there to be a sphere of uranium (U235) of radius one mile?	1