/r/AskPhysics

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I have a friend who does not believe in the force of gravity, merely thinking that everything 'heavier than air' is supposed to fall down. How do I scientifically disprove this?

527 upvotes • Hollow_Knight999

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What would happen if the staff of a nuclear power plant just stopped showing up to work one day?

151 upvotes • Gamerbrineofficial

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If the universe is expanding, what is outside the universe?

111 upvotes • Loafus1986

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How does an infinite universe make sense?

93 upvotes • MrMrsPotts

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If a body in freefall can't feel acceleration, why is there a falling sensation during the accelerating part of the fall?

92 upvotes • pizzystrizzy

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what will happen in 100 trillion years?

87 upvotes • ExternalTranslator62

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Why does space bend?

78 upvotes • semirick

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Is Big Bang as an explosion from singularity still a thing as a theory? Brian Cox said in an interview that what we really know is that 13 bilions years ago the universe was very hot and very dense and that's pretty much it

72 upvotes • Deep-Philosophy-807

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Can the universe be same size as observable universe?

57 upvotes • ExternalTranslator62

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If time moves slower on Earth than it does in empty space in the solar system due to gravity, does NASA account for this when planning out missions?

56 upvotes • Etvaht115

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
I have a friend who does not believe in the force of gravity, merely thinking that everything 'heavier than air' is supposed to fall down. How do I scientifically disprove this?	527	Hollow_Knight999
What would happen if the staff of a nuclear power plant just stopped showing up to work one day?	151	Gamerbrineofficial
If the universe is expanding, what is outside the universe?	111	Loafus1986
How does an infinite universe make sense?	93	MrMrsPotts
If a body in freefall can't feel acceleration, why is there a falling sensation during the accelerating part of the fall?	92	pizzystrizzy
what will happen in 100 trillion years?	87	ExternalTranslator62
Why does space bend?	78	semirick
Is Big Bang as an explosion from singularity still a thing as a theory? Brian Cox said in an interview that what we really know is that 13 bilions years ago the universe was very hot and very dense and that's pretty much it	72	Deep-Philosophy-807
Can the universe be same size as observable universe?	57	ExternalTranslator62
If time moves slower on Earth than it does in empty space in the solar system due to gravity, does NASA account for this when planning out missions?	56	Etvaht115