/r/askscience

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Why is mars so cold,-63 C, when its atmosphere is 95.3% CO2, which is considered a green house gas?

2090 upvotes • mor4

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If there's acid rain, is there such thing as acid snow?

2089 upvotes • whoisrupert

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American Chemical Society AMA: I'm Patti Galvan, I help K-8 teachers bring more chemistry to their students. Ask me anything about being a great chemist/scientist guest speaker in an elementary or middle school classroom.

2089 upvotes • AmerChemSocietyAMA

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Are larger planets/stars more "rare" than smaller ones?

2089 upvotes • regarizer

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Since a light sail is pushed by photons, can a laser propel itself through space by emitting photons?

2089 upvotes • gabesullice

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How single propeller Airplane are compensating the torque of the engine without spinning?

2089 upvotes • 0K4M1

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In a double slit experiment, is there a minimum necessary distance between the photon (or other particle) source and the slits in order to see interference?

2088 upvotes • Exlizard

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Is sound affected by gravity?

2086 upvotes • TheBrickInTheWall

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When we observe redshifted light from distant stars, how can we be sure that the red is due to the expansion of space, and not actually just more red than other light?

2086 upvotes • websitegenius

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How far is the horizon from a human point of view?

2085 upvotes • be_unicorn

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why is mars so cold,-63 C, when its atmosphere is 95.3% CO2, which is considered a green house gas?	2090	mor4
If there's acid rain, is there such thing as acid snow?	2089	whoisrupert
American Chemical Society AMA: I'm Patti Galvan, I help K-8 teachers bring more chemistry to their students. Ask me anything about being a great chemist/scientist guest speaker in an elementary or middle school classroom.	2089	AmerChemSocietyAMA
Are larger planets/stars more "rare" than smaller ones?	2089	regarizer
Since a light sail is pushed by photons, can a laser propel itself through space by emitting photons?	2089	gabesullice
How single propeller Airplane are compensating the torque of the engine without spinning?	2089	0K4M1
In a double slit experiment, is there a minimum necessary distance between the photon (or other particle) source and the slits in order to see interference?	2088	Exlizard
Is sound affected by gravity?	2086	TheBrickInTheWall
When we observe redshifted light from distant stars, how can we be sure that the red is due to the expansion of space, and not actually just more red than other light?	2086	websitegenius
How far is the horizon from a human point of view?	2085	be_unicorn