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

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When we extract energy from tides, what loses energy? Do we slow down the Earth or the Moon?

12387 upvotes

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They say that to test String Theory, we need to build a particle accelerator as large as out galaxy. Is it a technical limitation or a fundamental one?

6265 upvotes

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Why does flu even come in seasons?

3400 upvotes

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Is it possible to calculate nth digit of pi for any n in a limited amount of memory?

3269 upvotes

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Can you explain the logical leap from gravity to holographic principle?

1155 upvotes

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Eliezer Yudkowsky says, that a memory card containing a specification of the first 10000 Busy Beaver machines would be "worth more than the rest of the entire observable universe minus the card". How come?

290 upvotes

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When we say that a rotating gyroscope's axis is 'fixed', it is fixed relatively to what?

230 upvotes

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Is there a particular reason human ears are shaped like that? Other animals like cats or cows don't have it nearly as weird and complicated.

208 upvotes

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They say that a photon takes a million years to make it out of the Sun. But what does it even mean? How do we define that a particular photon now is the "same" photon that was there then?

167 upvotes

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Apparently, for Conservation of Energy to be true, time translation symmetry must hold. However, does it really hold in an expanding universe?

127 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
When we extract energy from tides, what loses energy? Do we slow down the Earth or the Moon?	12387
They say that to test String Theory, we need to build a particle accelerator as large as out galaxy. Is it a technical limitation or a fundamental one?	6265
Why does flu even come in seasons?	3400
Is it possible to calculate nth digit of pi for any n in a limited amount of memory?	3269
Can you explain the logical leap from gravity to holographic principle?	1155
Eliezer Yudkowsky says, that a memory card containing a specification of the first 10000 Busy Beaver machines would be "worth more than the rest of the entire observable universe minus the card". How come?	290
When we say that a rotating gyroscope's axis is 'fixed', it is fixed relatively to what?	230
Is there a particular reason human ears are shaped like that? Other animals like cats or cows don't have it nearly as weird and complicated.	208
They say that a photon takes a million years to make it out of the Sun. But what does it even mean? How do we define that a particular photon now is the "same" photon that was there then?	167
Apparently, for Conservation of Energy to be true, time translation symmetry must hold. However, does it really hold in an expanding universe?	127