/u/maybe-tomorrow's posts in /r/askscience

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If I was well enough insulated, could I survive on Pluto just using my body's heat?

36 upvotes

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Is there any way that the sandworms from Dune could actually travel through the sand like it is described in the books or would the sand be too dense a medium to move through?

32 upvotes

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On what basis/by what metric does dark energy make of 68% of the universe?

3 upvotes

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So James Cameron et all are (eventually) going asteroid mining. Awesome. But how are they going to safely drop the material from orbit? I imagine it would have to be foolproof before any world government would allow it.

2 upvotes

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How many extra calories would someone need to consume in order to replace a pint of blood?

1 upvotes

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How many calories, fat, whatever does someone have to consume to replace a single donation of blood? A pint of blood weighs about a pound. Does that mean that the donor would need to consume an extra ~3500 calories to replace it? Or is it more complicated than that?

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When I donate a pint of blood, how many extra calories, fat or protein grams or whatever do I have to consume to replenish that loss?

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Since light is energy and there is a mass to energy equivalency do I gain mass when a photon hits me even though photons are massless?

1 upvotes

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I accept that there is an equivency between mass and energy but why does Einstein use tha speed of light as one of the factors? Why "c" instead of some other value?

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If I could build a rocket that could move for millions of years but only 10 kph (6.2 mph for our Liberian friends), could I escape Earth's gravity? The solar system's?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If I was well enough insulated, could I survive on Pluto just using my body's heat?	36
Is there any way that the sandworms from Dune could actually travel through the sand like it is described in the books or would the sand be too dense a medium to move through?	32
On what basis/by what metric does dark energy make of 68% of the universe?	3
So James Cameron et all are (eventually) going asteroid mining. Awesome. But how are they going to safely drop the material from orbit? I imagine it would have to be foolproof before any world government would allow it.	2
How many extra calories would someone need to consume in order to replace a pint of blood?	1
How many calories, fat, whatever does someone have to consume to replace a single donation of blood? A pint of blood weighs about a pound. Does that mean that the donor would need to consume an extra ~3500 calories to replace it? Or is it more complicated than that?	1
When I donate a pint of blood, how many extra calories, fat or protein grams or whatever do I have to consume to replenish that loss?	1
Since light is energy and there is a mass to energy equivalency do I gain mass when a photon hits me even though photons are massless?	1
I accept that there is an equivency between mass and energy but why does Einstein use tha speed of light as one of the factors? Why "c" instead of some other value?	1
If I could build a rocket that could move for millions of years but only 10 kph (6.2 mph for our Liberian friends), could I escape Earth's gravity? The solar system's?	1