Light is deflected by gravity fields. Can we fire a laser around the sun and get "hit in the back" by it? |
- Light is deflected by gravity fields. Can we fire a laser around the sun and get "hit in the back" by it?
- Could you turn a smoke detector into a makeshift radiation detector?
- If I were to leave my fully charged laptop turned off and unplugged for five years, could I still start it up on battery only?
- Why do crabs which are greyish in color turn reddish or orange when boiled or cooked?
- Are all modern domestic dogs descended from wolves, or were some bred using other canines, such as foxes and coyotes?
- Has there been any further studies to support the idea that the jet stream warms Europe more than the North Atlantic Current?
- Would a observer in the moon see a Super Earth as we recently experienced a super moon?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- Chemists: What value/use do you get out of 2D and 3D representations of compounds? (Examples provided below)
- Will the moon ever impact Earth? Why or why not?
- A few hundred thousand years after the Big Bang, the universe cooled down to the point atoms were formed. What was matter made of before the cooling?
- Do blood transfusions "reset" things such as cholesterol or blood-borne diseases?
- Does light change colour when passing through a medium?
- How are babies able to express how they feel with certain actions without being taught how to do so?
- Purpose of Okazaki fragments?
- Is it possible to control the automatic stimulated behavior of your body?
- What forces prevent speeds greater than c in this thought experiment?
- Do objects actually have a centre of mass, or is it something we made make equations easier?
- What is the etymology of Stoichiometry?
- What are some examples of second order phase transitions?
- From where do plants grow?
- Why does UV light cause burns but not light on the other parts of the spectrum?
| Posted: 16 Nov 2016 01:26 AM PST Found this image while browsing the depths of Wikipedia. Could we fire a laser at ourselves by aiming so the light travels around the sun? Would it still be visible as a laser dot, or would it be spread out too much? [link] [comments]  |
| Could you turn a smoke detector into a makeshift radiation detector? Posted: 16 Nov 2016 04:56 AM PST I'm writing a nuclear war post-apocalyptic short story, and I was trying to think how people could detect pockets of radiation with everyday items. If you took a smoke detector, removed the Americium, and reversed the switch on the alarm (so that it goes off when the ionization circuit is closed instead of opened), could that function as a radiation detector? Would it pick up higher energy forms of radiation? [link] [comments]  |
| Posted: 16 Nov 2016 12:21 AM PST Average run-of-the-mill HP laptop, fully charged. I unplug it, turn it off, leave it at room temperature, and then I wait five years. Will I still be able to turn it on using battery power, or is the battery somehow discharged? [link] [comments]  |
| Why do crabs which are greyish in color turn reddish or orange when boiled or cooked? Posted: 16 Nov 2016 06:59 AM PST |
| Posted: 16 Nov 2016 05:01 AM PST |
| Posted: 16 Nov 2016 05:35 AM PST Richard Seager published a study back in 2002 that air moving eastwards from the Pacific to North America are funnelled south because of the Rockies, pick-up warm-air and then move back northwards to warm Europe, and that this has a greater effect than warm ocean waters. The lowered air pressure immediately east of the Rockies also draws cold air from the Arctic, thus enhancing the temperature contrast between Eastern seaboard and UK/Europe at the same latitude. (edit: This may be linked to the Arctic Oscillation, but I'm not sure). This idea does crop-up quite a bit on Reddit. But I wanted to know if those in Earth Sciences actually believe it, because even Piers Sellers, director of Earth Sciences at NASA said in the "Before The Flood" video that the Gulf Stream warms Europe. [link] [comments]  |
| Would a observer in the moon see a Super Earth as we recently experienced a super moon? Posted: 16 Nov 2016 03:58 AM PST |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 16 Nov 2016 07:05 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary 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]  |
| Posted: 16 Nov 2016 06:31 AM PST I saw on Facebook today that Wikipedia posted about today being the anniversary of Albert Hoffman first synthesizing LSD, so I read up on the article. As I got sucked into the black hole I kept getting intrigued by the compounds they display on the right, for example, like this compound of DMT. Likewise, I'm interested in the significance of what you really get out of looking at images like the compound of LSD represented in three ways. I'm particularly interested in how the one on the left says anything, but information on the middle would be cool, too! Do these images do anything for you? Can you tell what compounds are based on these images? Do they ever point to something interesting or significant? Could you look at one of these compounds, recognize it's components, and then know how to synthesize it in providing you had the equipment? I hope this gets answered. Thank you! [link] [comments]  |
| Will the moon ever impact Earth? Why or why not? Posted: 16 Nov 2016 06:26 AM PST |
| Posted: 16 Nov 2016 01:14 AM PST |
| Do blood transfusions "reset" things such as cholesterol or blood-borne diseases? Posted: 16 Nov 2016 06:07 AM PST |
| Does light change colour when passing through a medium? Posted: 16 Nov 2016 03:51 AM PST I'm learning about light, reflection, refraction and similar topics in Physics. The textbook says: where n = absolute refractive index, c = speed of light in vacuum, λ1 = original wavelength, λ2 = refracted wavelength. The book uses this to explain how light disperses into colours as it passes through a prism, which I mostly understand (because speed of light in a medium depends on frequency), allowing each colour to have it's own distinct refractive index. My question is: If For example: red light has a wavelength of about 700nm, if it passes through a glass with n = 1.5, the equation suggests it has a new wavelength in the medium of about 466nm; a significant change in colour. In other words, does this mean that the red light that exits a prism was a different colour before entering the prism, and has been shifted to a shorter wavelength by refraction? [link] [comments]  |
| How are babies able to express how they feel with certain actions without being taught how to do so? Posted: 16 Nov 2016 03:07 AM PST Like for example crying or laughing. Does this mean that even without learning how to express being happy we subconsciously know how to laugh or smile? If that's so whats making us automatically smile or laugh when we are feeling happy? [link] [comments]  |
| Posted: 16 Nov 2016 05:18 AM PST Is there a reason DNA replication occurs discontinuously in an energy expensive manner on the lagging strand? Understanding evolution does not take the most efficient path, is there any reason behind the constant priming and short sequence of bases being added? Additionally the expense of DNA ligase converting all the primers made because of the nature of the lagging strand. [link] [comments]  |
| Is it possible to control the automatic stimulated behavior of your body? Posted: 16 Nov 2016 05:08 AM PST I am not talking about just heart rate when I mean regulatory behavior. I am more interested in the things that it seems we have no control over, like sweating or goose bumps. Both of these generally occur due to an environment/stimulus, is it possible to cause these reactions without an enivronment stimulus present? Thanks in advance for any in sights :) Edit: To clarify a bit more, there are internal stimului that can cause some of these reactions to occur, like something embarrassing or being nervous causing you to sweat. I should clarify that I mean: is it possible to control these functions with the same sort of ease that we control arms/legs? [link] [comments]  |
| What forces prevent speeds greater than c in this thought experiment? Posted: 15 Nov 2016 09:48 PM PST Of course none of this is feasible with current technology and materials science, but... Assume that we have a rod extending from the equator on Earth into space. (For the sake of the argument, assume the rod is as strong as theoretically possible and extends through the earth out the other side an equal distance to maintain the balance of the Earth's rotation) If we could make the rod long enough, what forces would stop the tip of the rod from traveling at a speed faster than c when earth is rotating? Calculating, I get: c = 299792458 m/sec 1 light day = 25902068371200 m (this is also the circumference of the circle needed for the end of the rod to be traveling at the speed of light over the course of 24 hours) pi(d) = 25902068371200 m (get the diameter of circle above) diameter = 8244884435161 m radius (length of rod) = 4122442217581 m = 4,122,442,218 km Distance to Neptune = 4,700,000,000 km Maintaining Earth's rotational speed, we would need a rod that extended out from the equator 4,122,442,218 km (somewhere between Saturn and Neptune) for the tip of the rod to be traveling faster than c. If you have something that rotates faster (Jupiter for example), the distance you need for the rod is dramatically decreased. I get the distances are insanely far, but it's still infinitely less than infinite. So where's the weak point in the thought experiment. Would the atoms break apart in the rod, or would the earth's rotation slow for some reason? [link] [comments]  |
| Do objects actually have a centre of mass, or is it something we made make equations easier? Posted: 16 Nov 2016 03:43 AM PST Usually we treat objects as if they have a centre of mass, as in all the forces act on the objects centre of mass, and moments etc originate from the objects centre of mass. Although it doesn't make much sense to me that all the weight of an object acts on one point, as in, if you added an atom to the side of a tennis ball, it doesn't make sense that the atom then has no weight, and the weight is transferred to the objects centre of mass. So, to put it simply, do objects actually have a centre of mass? [link] [comments]  |
| What is the etymology of Stoichiometry? Posted: 16 Nov 2016 01:56 AM PST Stoichiometry is a term used in Chemistry and it pertains to the calculation of the quantities of chemical elements or compounds involved in chemical reactions. It is usually a 5-step process which uses ratios (generally, whole numbers) to determine mols or mass of a compound or element in a certain reaction. What is it's etymology? [link] [comments]  |
| What are some examples of second order phase transitions? Posted: 15 Nov 2016 11:10 PM PST For polymers, the glass transition is second order. I'm wondering what other types of 2nd order transitions are out there. [link] [comments]  |
| Posted: 16 Nov 2016 01:02 AM PST Like trees which grows from the outer rim from the cambium, where do plants grow from? My proffesor doesn't know so hope anyone can help clear that up! Thanks.. [link] [comments]  |
| Why does UV light cause burns but not light on the other parts of the spectrum? Posted: 15 Nov 2016 07:02 PM PST |
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