Does Large Hadron Collider need re-calibration after redefinition of SI units? |
- Does Large Hadron Collider need re-calibration after redefinition of SI units?
- AskScience AMA Series: I'm Dr Melanie Windridge, a plasma physicist who combines science with adventure. I have summited Mount Everest to explore the science that gets us to the top and I've written a book about the northern lights. AMA!
- Why does the edge of the Oort cloud continue to revolve around the sun when its closer to Proxima Centauri? Why is the edge of the Oort cloud still considered part of the solar system?
- Is there an altitude on Venus where both temperature and air pressure are habitable for humans, and you could stand in open air with just an oxygen mask?
- If the Moon was orbiting the Sun instead of the Earth, would it be classified as a planet or a dwarf planet ?
- How did early scientists recognise a new element?
- Are how dinosaurs sound in movies based on scientific data or just how cool it sounds?
- What determines life expectancy in a lifeform?
- Is there any formula that can be used to calculate what temperature a white dwarf of a given mass will be in x years?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- Is strong narcissm necessarily a malignant/negative personality trait?
- Is there a relation between enthalpy of neutralization and the pH of acid if the alkali used for reaction is the same?
- Does the expansion of the universe equate into trajectories of space craft to make sure they hit their target ?
- Is Romain lettuce more susceptible to E. coli than other types of vegetation? If so, why?
- If the Sun would suddenly disappear, would it take us minutes to realize the gravity is gone?
- How much lower were water levels during the time of Polynesia expansion ?
- Why do we want to care about Hilbert spaces beyond our own three dimensions?
- Is the sun at the same focus for all elliptical orbits?
- Why is there no standardized way of measuring speaker-system audio quality? What makes it difficult to objectively assess?
- Why does the sun set at a different time every evening?
- Is there a standardized naming convention for stars and exoplanets?
| Does Large Hadron Collider need re-calibration after redefinition of SI units? Posted: 20 Nov 2018 12:53 PM PST How are measurements in different detectors over at LHC connected to the current values of speed of light, kilogram, etc? Would redefinition of SI units need updates in other kinds of measuring devices in science laboratories across the world? [link] [comments]  |
| Posted: 21 Nov 2018 03:14 AM PST I'm Dr Melanie Windridge, a plasma physicist who combines science with adventure. In Spring 2018 I climbed Mount Everest and explored the science that helps climbers survive at high altitude and under extreme conditions. Along the way I spoke to experts and created a video series called "The Science of the Summit". It's hosted on the Institute of Physics' YouTube channel and covers statistics, fitness and training, risk and motivation, oxygen systems, mountain weather, the chemistry of clothing, communications in remote locations, physiology and medicine, and helicopter rescue. An improved understanding of high-altitude physiology, acclimatisation and nutrition was instrumental in the British success on Everest in 1953. Edmund Hillary and Tenzing Norgay were the first people ever to stand on the top of Everest. They were supported not only by their expedition climbing team mates but also by the work of physiologist Griffith Pugh and others. Since their successful summit, science, technology and our understanding of physiology at high altitude have further improved. In 2016 I published "Aurora: In Search of the Northern Lights". The book is a journey of discovery and explores the visual beauty, legends and science of the northern lights, including the developing threat of space weather. I'm fascinated by the aurora. It's a marvel unlike any other in which the powers of astronomy, geology, magnetism and atomic physics combine to create one of the wonders of the natural world. My explorations of the aurora have led me to many Arctic destinations such as Sweden, Norway, Canada, Iceland and Svalbard. I have written a blog about Science at the Extremes for several years. You can have a look and subscribe to it here: http://melaniewindridge.co.uk/blog_home I'm here to talk about science and adventure - my experiences on Everest and in the Arctic with the aurora, and the science and technology that support high-altitude climbers and how they have improved and developed over the years. I'll start around 4pm UT (11am ET). AMA! [link] [comments]  |
| Posted: 20 Nov 2018 11:46 PM PST From my understanding, the Oort cloud is like a sphere that revolves around the earth at a distance of up to 200,000 AU from the solar system. It is the edge of the solar system. Meanwhile, the closest star; Proxima Centauri is just 267,000 AU away. Why is the edge of the Oort cloud still considered part of our solar system when it is far closer to Proxima Centauri, and is the very edge of the Oort cloud still a sphere-like shape as is theorised? If so, why when it is closer to Proxima is it still considered a section of our solar system? Edit: Rephrasing [link] [comments]  |
| Posted: 21 Nov 2018 07:42 AM PST I keep hearing this suggestion, but it seems unlikely given the insane surface temp, sulfuric acid rain, etc. [link] [comments]  |
| Posted: 21 Nov 2018 07:25 AM PST |
| How did early scientists recognise a new element? Posted: 21 Nov 2018 02:23 AM PST For example, I read that Scheele and Priestly discovered oxygen independently in 1772 and 1774 respectively, but it was Lavoisier, who (again independently) discovered it in 1775, that first recognised it as an element. What did Lavoisier see that the other two hadn't? [link] [comments]  |
| Are how dinosaurs sound in movies based on scientific data or just how cool it sounds? Posted: 20 Nov 2018 09:24 PM PST |
| What determines life expectancy in a lifeform? Posted: 21 Nov 2018 05:08 AM PST Yesterday I visited my neighbor and he introduced me to his parrot. a smart grey fella with a red chest. my neighbor then told me he was 77 years old. I thought it was freaky that this bird has lived this long and I started googling average life expectancies of animals, and they seem ... completely random?! So I wanted to ask, is there any science behind why some animals live longer and some don't and could you explain? [link] [comments]  |
| Posted: 21 Nov 2018 04:28 AM PST I have Googled around and only found incomplete ones that cannot really be used to calculate it. Thanks in advance to people for answers, not a homework question, I just have an unhealthy fascination with far future of the universe. I know that white dwarfs take 1015 years to cool to 5 K and possibly much longer than that as WIMP annihilation may heat them to 63 K (according to this often quoted, and good paper https://arxiv.org/abs/astro-ph/9701131 ) and that the oldest white dwarfs in our universe are 11-12 Gyr old and are at 3900 K, but I haven't been able to find any info about how fast it cools in the meantime. It seems that it cools very fast (in deep time terms) from the 100000 K temperature of a pre-white dwarf (planetary nebula's central star) to 25000 K of a "young" white dwarf like Sirius B (330 Myr old) then much more slowly to around 6200 K (Van Maanen's star, 3.13 billion years old) and MUCH slower than that to 3900 K (like WD 0346+246, which is almost 9 billion years older, but still has more than half of Van Maanen's star temperature). [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 21 Nov 2018 07:11 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Is strong narcissm necessarily a malignant/negative personality trait? Posted: 21 Nov 2018 06:49 AM PST |
| Posted: 21 Nov 2018 06:47 AM PST I know that the temperature, mass and specific heat capacity affect the enthalpy but is there anything that would explain why different acids reacting with the same alkali would make a difference? [link] [comments]  |
| Posted: 20 Nov 2018 06:38 PM PST |
| Is Romain lettuce more susceptible to E. coli than other types of vegetation? If so, why? Posted: 20 Nov 2018 06:27 PM PST |
| If the Sun would suddenly disappear, would it take us minutes to realize the gravity is gone? Posted: 21 Nov 2018 05:18 AM PST Me and one of my colleagues (both absolute laymen) were discussing this just now. He argued that there is not gravity particle in the Standard Model and therefore gravity is not an 'interaction'. his conclusion was that this means that if the Sun would suddenly disappear the change in gravity would be literally instant, disregarding the speed of light. I personally do not believe this, since the speed of light as a cosmic speed limit has been ingrained into my mind by popular science programs. Can someone here please explain me how this would work theoretically? [link] [comments]  |
| How much lower were water levels during the time of Polynesia expansion ? Posted: 21 Nov 2018 05:15 AM PST |
| Why do we want to care about Hilbert spaces beyond our own three dimensions? Posted: 20 Nov 2018 07:43 PM PST Practically speaking, I'm unable to see what uses we may have for solving extra-dimensional problems beyond our own three dimensional Euclidean space; That is to say, I fail to see any practical use or application of trying to understand what exists outside our plane of existance. Can anyone help explain to me why we created Hilbert space to begin with, and what we can do with them? [link] [comments]  |
| Is the sun at the same focus for all elliptical orbits? Posted: 20 Nov 2018 11:18 PM PST Since there are two focii for any ellipse and the sun is at one focus of an elliptical orbit, is it the same one for all planets? [link] [comments]  |
| Posted: 20 Nov 2018 03:19 PM PST Sure, there's a big subjectivity factor. But I would have thought there would be a way to holistically (or otherwise) quantify clarity, fidelity, warmth, space, and all the other things audiophiles seem able to discern, but technology apparently can't. [link] [comments]  |
| Why does the sun set at a different time every evening? Posted: 20 Nov 2018 06:12 PM PST Why does the sun set at a slightly different time each evening? I thought the Earth rotated at the same speed constantly? [link] [comments]  |
| Is there a standardized naming convention for stars and exoplanets? Posted: 20 Nov 2018 01:22 PM PST |
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