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

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How can we be so sure that the universe is "expanding"?

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Wouldn't anyone going in or out of hyperspace in Star Wars die due to the massive acceleration/deceleration spike they'd experience?

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How big would Earth be if all of the empty space between atoms was gone?

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How can we be so sure that Black Holes have an "infinite" mass?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How can we be so sure that the universe is "expanding"?	1
Wouldn't anyone going in or out of hyperspace in Star Wars die due to the massive acceleration/deceleration spike they'd experience?	1
How big would Earth be if all of the empty space between atoms was gone?	1
How can we be so sure that Black Holes have an "infinite" mass?	1