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

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"At near-light speed, we could travel to other star systems within a human lifetime, but when we arrived, everyone on earth would be long dead." At what speed does this scenario start to be a problem? How fast can we travel through space before years in the ship start to look like decades on earth?

2872 upvotes

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If I leave the faucet on in an area with abundant freshwater resources (e.g., the Great Lakes region), is that water "wasted?" Or does it make its way back into the water supply pretty easily?

558 upvotes

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Can I grow plants in my apartment with the reflection of sunlight?

59 upvotes

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Is the empty space near the Sun (say, closer than Mercury) hot or cold?

14 upvotes

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How can we see Venus at night, when it's between us and the sun?

3 upvotes

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Someone dies in a spaceship with the atmosphere vented into space. After sitting in vacuum for a few years, someone else comes along and turns life support back on. Does the body rot?

3 upvotes

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Several cleaning products, most notably Febreze, claim to "neutralize odors," rather than just covering them up. Given that odors are justvarious floating particles of stuff that get in your nose (correct me if I'm wrong), how is that even possible? Or is it all a big sham?

2 upvotes

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What's the mechanism that keeps our core body temperature constant?

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Muhammad Ali once claimed "I'm so fast that last night I turned off the light switch in my hotel room and was in bed before the room was dark!" What would be the consequences/implications for Ali and the surrounding area if that boast was true?

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What evolutionary forces led to fruits and vegetables being so vitamin-rich?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
"At near-light speed, we could travel to other star systems within a human lifetime, but when we arrived, everyone on earth would be long dead." At what speed does this scenario start to be a problem? How fast can we travel through space before years in the ship start to look like decades on earth?	2872
If I leave the faucet on in an area with abundant freshwater resources (e.g., the Great Lakes region), is that water "wasted?" Or does it make its way back into the water supply pretty easily?	558
Can I grow plants in my apartment with the reflection of sunlight?	59
Is the empty space near the Sun (say, closer than Mercury) hot or cold?	14
How can we see Venus at night, when it's between us and the sun?	3
Someone dies in a spaceship with the atmosphere vented into space. After sitting in vacuum for a few years, someone else comes along and turns life support back on. Does the body rot?	3
Several cleaning products, most notably Febreze, claim to "neutralize odors," rather than just covering them up. Given that odors are justvarious floating particles of stuff that get in your nose (correct me if I'm wrong), how is that even possible? Or is it all a big sham?	2
What's the mechanism that keeps our core body temperature constant?	2
Muhammad Ali once claimed "I'm so fast that last night I turned off the light switch in my hotel room and was in bed before the room was dark!" What would be the consequences/implications for Ali and the surrounding area if that boast was true?	1
What evolutionary forces led to fruits and vegetables being so vitamin-rich?	1