What does "Entropy" mean? |
- What does "Entropy" mean?
- AskScience AMA Series: I am Avi Loeb and I'm here to explain how I noticed the first tentative sign for Intelligent life beyond earth. AMA!
- When astronomers refer to distances between galaxies, do they mean the distance as we observe them or as they are now?
- Do older people vaccinated for Covid have a “good” immune response from it?
- If all electrons are identical, then how can they have different energy levels?
- Do gravitional waves effect time?
- How does an increase in humidity assist plant growth?
- How laser measuring tools work?
- Do all vaccines get tested for sterilising immunity?
- With sunglasses on, one of my computer monitors is almost unaffected, only slightly darker, and the other one turns entirely black. What about monitors or sunglasses makes them react differently?
- Optics/Eye anatomy: How *exactly* does the eye perceive the color green from a mixture of yellow and cyan pigments on a white sheet of paper?
- Why do infected cases grow in waves during a pandemic?
- What causes the steams different behaviour?
- Are the current COVID-19 vaccines not as effective for certain races?
- Is it possible to store video data as a photo?
- I'm watching Fritz Lang's 1931 silent film "Woman in the Moon" and they got surprisingly accurate with some of the science of orbital mechanics. When (and who) calculated the physics of spaceflight to the moon?
| Posted: 27 Jan 2021 02:20 PM PST so i know it has to do with the second law of thermodynamics, which as far as i know means that different kinds of energy will always try to "spread themselves out", unless hindered. but what exactly does 'entropy' mean. what does it like define or where does it fit in. [link] [comments]  |
| Posted: 28 Jan 2021 06:12 AM PST I am the Frank B. Baird, Jr., Professor of Science at Harvard University. I received a PhD in Physics from the Hebrew University of Jerusalem in Israel at age 24, while leading the first international project supported by the Strategic Defense Initiative (1983-1988). Subsequently I was a long-term member of the Institute for Advanced Study at Princeton (1988-1993). Throughout my career, I have written 8 books, including most recently, Extraterrestrial (Houghton Mifflin Harcourt, 2021), and about 800 papers (with an h-index of 112) on a wide range of topics, including black holes, the first stars, the search for extraterrestrial life and the future of the Universe. I had been the longest serving Chair of Harvard's Department of Astronomy (2011- 2020), Founding Director of Harvard's Black Hole Initiative (2016-present) and Director of the Institute for Theory and Computation (2007-present) within the Harvard-Smithsonian Center for Astrophysics. I also chair the Board on Physics and Astronomy of the National Academies (2018-present) which oversees all Decadal Surveys in Physics and Astronomy. I am an elected fellow of the American Academy of Arts & Sciences, the American Physical Society, and the International Academy of Astronautics. In addition, I am a member of the President's Council of Advisors on Science and Technology (PCAST) at the White House and a member of the Advisory Board for "Einstein: Visualize the Impossible" of the Hebrew University. I also chairs the Advisory Committee for the Breakthrough Starshot Initiative (2016-present) and serve as the Science Theory Director for all Initiatives of the Breakthrough Prize Foundation. In 2012, TIME magazine [pdf] selected me as one of the 25 most influential people in space and in 2020 I was selected among the 14 most inspiring Israelis of the last decade. Click here for my commentaries on innovation and diversity. I will be on at 11a.m. EST (16 UT), AMA! Username: /u/Avi-Loeb [link] [comments]  |
| Posted: 27 Jan 2021 11:20 PM PST For example, if astronomers describe the distance between two galaxies in a supervoid that is a billion light-years away to be 150 million light-years. Is that distance representative of what we have observed (essentially an image from a billion years ago) or as it is now (accounting for the expansion of the universe)? [link] [comments]  |
| Do older people vaccinated for Covid have a “good” immune response from it? Posted: 28 Jan 2021 05:18 AM PST My otherwise very healthy and independent 94yo grandmother received her first Covid vaccine 5 days ago. I asked her if her arm was as sore as mine and she said it doesn't hurt at all. I was wondering if the immune response in the older population has been studied much. I'm just curious if her complete lack of side effects is an indication that her body did not get a strong immune response. [link] [comments]  |
| If all electrons are identical, then how can they have different energy levels? Posted: 28 Jan 2021 06:33 AM PST I've heard that the farther an electron is from the nucleus, the more energetic it is. But how can this be if all electrons are identical? [link] [comments]  |
| Do gravitional waves effect time? Posted: 27 Jan 2021 09:47 PM PST Since gravitional waves are ripples in space-time, how do they effect the time component? Is there any kind of time dilation? [link] [comments]  |
| How does an increase in humidity assist plant growth? Posted: 27 Jan 2021 11:14 PM PST For many indoor plants that have evolved to live in more humid environments, it appears that reducing humidity levels can impair their growth. Why is this? Given that an increase in humidity decreases the rate of transpiration and thus slows nutrient uptake from the soil, why would they grow faster? [link] [comments]  |
| How laser measuring tools work? Posted: 27 Jan 2021 07:23 PM PST Ultrasound space measuring works by measuring the time it takes to a sound wave go, reflect and return to the tool. But we cant really measure the speed of light cuz it is too fast to be detected, so laser measuring tools can't work like ultrasound tools. So how does it work? [link] [comments]  |
| Do all vaccines get tested for sterilising immunity? Posted: 27 Jan 2021 03:11 PM PST People are saying that we don't know if the new COVID vaccines will affect transmission of COVID. Every other vaccine I heard of stops transmission of whatever they're vaccinating against, so I don't understand why this would be different. However, if they all need to be tested for this I would understand, as it would then just be a routine question. Do all vaccines need to be specifically evaluated for sterilising immunity, or is this something we're only worried about with the new vaccines? [link] [comments]  |
| Posted: 27 Jan 2021 02:30 PM PST |
| Posted: 27 Jan 2021 02:18 PM PST Thanks in advance for entertaining my very basic question. Here's what I think I know so far: White light shines from a light source and hits the cyan and yellow pigments. The pigments reflect the wavelengths that correspond to cyan (ca 475nm) and yellow (ca 580nm) respectively, and absorb the rest. The "cyan" and "yellow" wavelengths then enter the eye. If the above is correct, does that mean that the tristimulus values of spectral green and cyan+yellow are the same, like in the case of yellow and green+red? Apologies if this is a dumb question. I think my confusion comes in part from trying to figure how additive and subtractive color models fit in the real world. Would it be accurate to say that subtractive color is a part of physical reality, while additive color exists only as a part of human perception? Bonus question: I understand that in reality a blue object does reflect other wavelengths besides "blue" ones, albeit at a lower intensity. But are there chemicals or chemical structures that manage to exclusively reflect an incredibly narrow range of wavelengths (say, 500-505nm), without reflecting any other wavelengths at any degree of intensity? Thank you for your time! [link] [comments]  |
| Why do infected cases grow in waves during a pandemic? Posted: 27 Jan 2021 11:04 AM PST At the beginning of the coronavirus pandemic they kept telling us on the news about how it would come in waves, and from looking at regional charts, it really has happened in waves. Is that because of human behavior or something to do with the virus itself or what? Edit: to clarify my question, if we didn't do lockdowns, didn't have holidays, or other human type of social behavior changes, would we still see the disease spread in waves? [link] [comments]  |
| What causes the steams different behaviour? Posted: 27 Jan 2021 11:02 PM PST Why is it that the steam coming from outside into my bathroom, through my window, is falling to the floor, whilst the steam coming from inside the shower cubicle rises to the ceiling? PS: I'm not sure which category this is, but I believe it's physics [link] [comments]  |
| Are the current COVID-19 vaccines not as effective for certain races? Posted: 27 Jan 2021 04:45 PM PST I just read an article from MIT that said the immune response was not as strong in people with certain genetic backgrounds (they specifically mentioned Asians). I don't understand the science behind the research. Is this a concern? If so, can the drug manufacturers improve the vaccines? [link] [comments]  |
| Is it possible to store video data as a photo? Posted: 27 Jan 2021 09:45 PM PST This probably sounds like a dumb pointless question and I'm sorry if this isn't the right sub to be asking this sort of thing. I know there are ways of making sounds into images and vice versa, like using SSTV image generators and decoders for example. I was wondering if there is a way you can take the digital video data from a video and save it or transform it into a single picture? Hopefully this makes sense. [link] [comments]  |
| Posted: 27 Jan 2021 01:28 AM PST Outside the whole "we can breathe on the moon" aspect, the 1931 silent film surprised me with the accuracy of the spaceflight facts a decade or two before the big rocket programs:
Kepler and Newton advanced planetary mechanics and Halley famously applied that to his comet, but I can't seem to find info on the first to figure out spaceflight parameters for a flight to the moon. (Probably just flubbing search terms late at night.) [link] [comments]  |
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