How did Voyager 1 send back images of earth? Film or digital?! lt always bothers me |
- How did Voyager 1 send back images of earth? Film or digital?! lt always bothers me
- How do our eyes see the stars much better than a camera?
- Why doesn't bacteria develop a resistance against alcohol such as hand sanitizer, but does so towards antibiotics?
- Why is “five year survival” the benchmark for successful treatment in cancer? Do some forms of cancer have a different “timeline”?
- With no references or compass, is it possible to distinguish photos of a sunset or a dawn?
- Are the muscles in the mouth needed for chewing subject to atrophy after events like a coma or extended starvation?
- Why is fiberglass safe vs asbestos?
- Splitting atoms other than uranium?
- If someone was fluent in a language when they were really young (4 or 5 yo) but forgot it later on, will relearning it as a teenager or adult be easier for them? Would they be better at pronunciation and/or other aspects of the language?
- Magnetic monopoles: what is their significance and why can't we find them?
- Why is the level of Carbon-14 (approximately) constant?
- Half-life of knowledge? A lecture from 1979 on photons by Richard Feynman is on YouTube. Would a 1979 Feynman be able to give a quantum mechanics lecture that will still be "accurate" in 2018?
- Why does hot air rise?
- Can frogs and toads tell where they are jumping to? If one were standing on a platform high enough to kill it if it were to jump off, would it know not to?
- Why do vortices that come off of aircrafts fall the way they do, as if they were low density objects?
- Why is it so important not to eat before anesthesia?
- If the earth had no velocity around the sun, would it just fall into the sun? How long would that take?
- What would happen if you microwaved something containing no water molecules?
- Does NASA make money from the technology they develop?
- How did sea water become salty?
| How did Voyager 1 send back images of earth? Film or digital?! lt always bothers me Posted: 25 Feb 2018 06:10 AM PST I'm not suggesting it ejected a film c canister back to earth....but how did it convert an image to signal and then transmit it? [link] [comments]  |
| How do our eyes see the stars much better than a camera? Posted: 24 Feb 2018 10:18 PM PST Many cameras have much larger sensors our retinas, and larger apertures than our pupils. Still, they need long exposures to capture the stars. The frame rate of the human eye is often said to be in the hundreds. So why can my eye see the stars with a 1/300 second exposure when cameras require 6 or 7 seconds before the same number of stars are visible in the image? [link] [comments]  |
| Posted: 24 Feb 2018 04:39 PM PST That an abundant use of antibiotics increases the risk of bacteria evolving a resistance towards the specific antibiotic everybody knows, but why doesn't it happen with Alcohol such as hand sanitizer or similar. Or does bacteria develop resistance towards alcohol as well, and in that case, why are we still encouraged to use hand sanitizers as much as possible? [link] [comments]  |
| Posted: 24 Feb 2018 03:10 PM PST |
| With no references or compass, is it possible to distinguish photos of a sunset or a dawn? Posted: 24 Feb 2018 11:02 AM PST If I took a snap shot of the sun touching an ocean horizon with no land or cloud visible in the am, then the pm, is it possible to tell the difference? [link] [comments]  |
| Posted: 24 Feb 2018 02:20 PM PST I was wondering if it becomes hard to chew similarly yo how it is hard to walk after not using your legs for a long period of time. Also, is therapy to retrain your mouth muscles like it is needed for the legs? [link] [comments]  |
| Why is fiberglass safe vs asbestos? Posted: 24 Feb 2018 12:46 PM PST They're both made of tiny fibers. What is the difference between them? [link] [comments]  |
| Splitting atoms other than uranium? Posted: 24 Feb 2018 02:11 PM PST I understand that when we split a uranium atom, a lot of energy is released due to nuclear fission. How about other atoms? Can we split, say, a copper atom or a lithium atom to also release vast amounts of energy? Is uranium used just because it is easy to split? If so, what makes it hard to split a copper or lithium atom? [link] [comments]  |
| Posted: 24 Feb 2018 08:33 AM PST |
| Magnetic monopoles: what is their significance and why can't we find them? Posted: 24 Feb 2018 08:38 PM PST My professor was telling us a few days ago about the fact that nobody has ever found a magnetic monopole. He also said that if discovered, magnetic monopoles could have huge implications for technology, and would also explain the quantization of electric charge. What would be the challenges in creating a magnetic monopole, what would their uses be in technology, and what the hell is quantization of electric charge/ why would monopoles explain this? [link] [comments]  |
| Why is the level of Carbon-14 (approximately) constant? Posted: 24 Feb 2018 08:31 PM PST My understanding is that Carbon-14 is converted from Nitrogen-14 in the Atmosphere by Cosmic Rays. It then slowly breaks down by beta-decay back into Nitrogen-14. Also, I've seen it stated numerous places that the level of Carbon-14 is assumed to be fairly constant over time (i.e. the rate of breakdown is equal to the rate of production). However, why, under normal circumstances, would the rate of production be in any kind of equilibrium with the rate of decay, such that the total carbon-14 in the atmosphere is assumed to be constant? The two processes (production via cosmic rays and breakdown via beta-decay) are completely independent and do not feedback on each other. Carbon-14 dating assumes that the level of carbon-14 is (relatively) constant throughout time, correcting for various anomalies like supernovas etc via tree rings and other sources. Shouldn't there be either a slow accumulation or a slow depletion of the Carbon-14 in the atmosphere over time (ignoring the nearly impossible coincidence that these two independent processes happen to be exactly balanced)? [link] [comments]  |
| Posted: 24 Feb 2018 09:13 AM PST I found this Feynman lecture on YouTube called "Photons: Corpuscles of Light." The first part is an hour long. I have not watched it, but I want to because 1) I love Feynman and his passion for science, and 2) I want to learn more about photons. However, I would not watch a lecture from 1979 on, say, pain science, because I know that I would not be able to trust the information to be accurate. 1979 was a long time ago, at least in the medical sciences, which is what I am familiar with. How much has our knowledge of quantum mechanics -- photons in particular -- changed since 1979? Can I watch this lecture and expect 1979 Feynman to still be "accurate" by 2018 quantum mechanics standards? This is the video: https://youtu.be/xdZMXWmlp9g [link] [comments]  |
| Posted: 24 Feb 2018 12:57 PM PST |
| Posted: 24 Feb 2018 08:09 AM PST |
| Posted: 24 Feb 2018 11:10 AM PST I'm in aviation right now and have wondered how swirling vortices fall at a rate of only a few hundred feet a minute. Also, I need to be aware of vortices that linger on runways after heavy aircraft takeoffs/landings. Just wanted an explanation. Thanks! [link] [comments]  |
| Why is it so important not to eat before anesthesia? Posted: 24 Feb 2018 08:46 AM PST |
| Posted: 24 Feb 2018 02:42 PM PST |
| What would happen if you microwaved something containing no water molecules? Posted: 24 Feb 2018 12:23 PM PST My understanding of microwaves has always been that they function by causing water molecules to vibrate. Thus, i would expect that microwaving something containing no water would accomplish nothing. Is this correct? [link] [comments]  |
| Does NASA make money from the technology they develop? Posted: 24 Feb 2018 07:52 PM PST This website details many things developed by NASA. When they develop new technology, do they sell it or otherwise make money from it? [link] [comments]  |
| How did sea water become salty? Posted: 24 Feb 2018 11:37 AM PST Is salt just a common compound found in rocks which then dissolves into water? [link] [comments]  |
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