Does the supermassive black hole in the center of our galaxy have any effects on the way our planet, star, or solar system behave? |
- Does the supermassive black hole in the center of our galaxy have any effects on the way our planet, star, or solar system behave?
- Why do most experimental fusion reactors focus on deuterium-tritium fusion, and why isn't deuterium-proton fusion ever used?
- Why do infants lose certain abilities around 6 months old, such as distinguishing between different language sounds and different primates' faces?
- Why doesn't the n-body problem make the rotation curves of disc galaxies unpredictable?
- Could Tokamaks be run in a multi-phase configuration?
- Does the decay energy affect the power output in a betavoltaeic battery?
- Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
- Do we calculate time or measure it?
- Naked singularities, how can such a concept exist?
- Is gravity uniform regardless of density?
- How are satellites launched as not to run into each other?
- Do boiling water in microwave oven kills more bacteria than regular boiling, because microwaves itself kills bacteria too?
- Are these numbers for the elements in the sun correct?
- How dark is it outside of solar systems?
- When we look into the night sky what exactly are the bright lights?
- Where does acoustic energy go in a vacuum?
- Are there any stars travelling around their galaxy at relativistic speeds?
- How can astrophysicists accurately know what happened a trillion the of a second after the big bang?
- Compton scattering measurements: What is the physical meaning of integrating over a certain spike in energy spectrum?
- How did Henry Cavendish manage to calculate the Earth's mass back in 1798?
- Is Radon Gas a real danger in homes?
- How far away is the andromeda galaxy ?
| Posted: 06 Dec 2016 08:03 PM PST If it's gravity is strong enough to hold together a galaxy, does it have some effect on individual planets/stars within the galaxy? How would these effects differ based on the distance from the black hole? [link] [comments]  |
| Posted: 06 Dec 2016 06:37 PM PST Deuterium-tritium fusion produces a helium-4 nucleus and neutron. In stars, deuterium and protons are fused to create helium-3 without the production of a neutron, in the second step of the proton-proton chain reaction. Wouldn't deuterium-proton fusion be the much better choice, considering they have the same amount of electrical repulsion, wouldn't generate power in the form of neutrons, and are much cheaper? [link] [comments]  |
| Posted: 06 Dec 2016 10:23 AM PST |
| Why doesn't the n-body problem make the rotation curves of disc galaxies unpredictable? Posted: 06 Dec 2016 01:16 PM PST The difference between the observed and expected rotation curves of disc galaxies is explained by the presence of dark matter. But how do we even have a predicted rotation curve for disc galaxies? Doesn't the n-body problem mean the radial velocities of the stars in a galaxy are completely chaotic and unpredictable? [link] [comments]  |
| Could Tokamaks be run in a multi-phase configuration? Posted: 06 Dec 2016 01:42 PM PST Tokamaks rely on current in the plasma to produce a poloidal field. Since the toroidal coils can't keep increasing the field strength forever, could tokamaks benefit from being run in a multiphase configuration? Could the decay of one toroidal field drive the production of another? Are other heating methods sufficient to maintain a toroidal current, or are tokamaks a fundamentally transient configuration? [link] [comments]  |
| Does the decay energy affect the power output in a betavoltaeic battery? Posted: 06 Dec 2016 01:40 PM PST I mean does a low energy beta emitter produce as much power as a higher power emitter? (in a power cell) (if so - why? why can't we use the higher energy electrons better?) As far as I understood it it isn't the extra electron produced that "becomes" the power but it has something to do with a technology like solar cells? (could we use other materials to capture for instance gamma rays to produce power?) What happends to the electron later - Does it add to the power output by itself so to speak? (if we just packed a beta emitter inside a metal casing, would the casing get a higher voltage potential from capturing the electrons?) Are there even vast differences between beta decay energies of different isotopes to begin with? (I'm having some problems finding tables of beta decay energies and are finding weird (what seems like probability) graphs of energies. Cobalt-60 beta decay energy seems to be comparable(-ish) (in orders of magnitude) to carbon-14 decay energies if I understand things right). I know this is a lot of jumbled together questions, but I guess my main curiosity is the title one. Thank you [link] [comments]  |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 07 Dec 2016 07:05 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology 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]  |
| Do we calculate time or measure it? Posted: 07 Dec 2016 05:07 AM PST Do watches actually measure time or does it calculate it by counting it, Because I've been thinking and until now I haven't found a Scalar physical quantity that can be measured by itself, We usually calculate it from a Vector physical quantity, like how we usually calculate mass from weight, but we can't measure mass by itself. [link] [comments]  |
| Naked singularities, how can such a concept exist? Posted: 07 Dec 2016 02:53 AM PST Trying to wrap my mind around these things gives me a headache, how can a singularity exist without an event horizon? What made people come up with this concept in the first place? I mean, the entire fact that a singularity exists means that it MUST create an event horizon? It's like trying to imagine the Sun existing without gravity. [link] [comments]  |
| Is gravity uniform regardless of density? Posted: 07 Dec 2016 05:04 AM PST Specifically, planetary gravity. Does a planets gravitational pull come from the entirety of the planet as a whole despite say, differences in the geologic layers' density? Or is all of that planets gravity coming together with more gravity generated from certain areas like the core? Am I even understanding gravity correctly that it exists as a whole (uniform) or can gravity be stronger on one side of a planet than the other? Thank you for your time. [link] [comments]  |
| How are satellites launched as not to run into each other? Posted: 07 Dec 2016 02:17 AM PST With Elon Musk wanting to launch 4,000+ satellites into the atmosphere, how are satellites launched so that they don't collide in orbit? Is there any math or timing and angles done to assure that none of the (currently as far as I can find) 2,271 satellites will remain in orbit indefinitely? [link] [comments]  |
| Posted: 06 Dec 2016 08:32 AM PST |
| Are these numbers for the elements in the sun correct? Posted: 07 Dec 2016 04:01 AM PST So, there's this site that gives some numbers for the abundance of different elements in the sun. I've seen that list a few times recently, so apparently it's something people go by. Those numbers can't be right, can they? What struck me was the abundances of iron and neon. There's supposedly fewer neon atoms than iron atoms. However, the neon is written as weighing more, even though a neon atom weighs less than an iron atom. So, this seems not quite right. Or am I missing something? [link] [comments]  |
| How dark is it outside of solar systems? Posted: 07 Dec 2016 06:16 AM PST So basically if I was in a space ship travelling to a different solar system and stopped and went outside of the ship. How dark or light would it be? [link] [comments]  |
| When we look into the night sky what exactly are the bright lights? Posted: 07 Dec 2016 05:32 AM PST Are the points of light galaxies or stars? After looking into the hubble deep space image: http://hubblesite.org/newscenter/archive/releases/2012/37/image/a/ It states that there are only galaxies, the clearer ones being closer and the discrepant lights being further away. When we look into the night sky from earth are we looking at galaxies? Or stars? From what I've been researching, it seems like we should only be able to see stars in our galaxy but the Hubble Deep space image can see galaxies. Thanks for any response. [link] [comments]  |
| Where does acoustic energy go in a vacuum? Posted: 06 Dec 2016 04:54 PM PST In a supernova, it seems that sound would travel for a distance through a rapidly expanding gas cloud. Eventually though, the gas would be too thin for sound to travel through. At this point... What happens? I had an idea that the vibrations would be locked in whatever particle is carrying it, creating friction which would produce heat which could radiate through a vacuum, but I have no idea of the plausibility of this. [link] [comments]  |
| Are there any stars travelling around their galaxy at relativistic speeds? Posted: 07 Dec 2016 04:30 AM PST If that's possible what kinds of effects would that have on the star and any planets orbiting it. [link] [comments]  |
| How can astrophysicists accurately know what happened a trillion the of a second after the big bang? Posted: 07 Dec 2016 04:22 AM PST I'm reading a book by Neil deGrasse Tyson and it is talking about what the universe was like at a specific point (trillionth of a second) after the initial big bang. I'm wondering how one can know so much about such a tiny instance in time? Edit: title autocorrected to "trillion the" should be trillionth. [link] [comments]  |
| Posted: 07 Dec 2016 04:09 AM PST Hi reddit! Me and my friend are both undergrad physics students who are doing a course in which we have to give a short lecture on Compton scattering based on our own measurements. With our data we can draw the energy spectrum with y-axis being the number of photons that hit the detector, and x-axis being the energy of those photons. Now, we are supposed to integrate over the spike with different methods (both numerically and analytically, as we have) but we both just fail to understand what it is that we get from integrating it! The incoming photons are coming from an Am-241 sample being 59.6keV and our spikes are slightly lower (~50keV) just like they should be. As an example integrating our first sample: The spike was at 51.5keV and integrating over it in matlab (after finding a proper distribution function for it) gives us 68.74keV. What is it that this 68.74keV integral is supposed to tell us here? It isn't the total energy of all the photons that hit the region since the number of photons that hit there was around 250 of them? The total energy over the whole measurement should be like ~12MeV. I don't see that working. We both just fail to see any logical way to interpret the result. I'm guessing this is something really stupid that we just haven't been able to see or maybe we're just doing something wrong so I figured maybe the people here could offer their help. Thanks! :) [link] [comments]  |
| How did Henry Cavendish manage to calculate the Earth's mass back in 1798? Posted: 06 Dec 2016 03:03 PM PST |
| Is Radon Gas a real danger in homes? Posted: 07 Dec 2016 12:14 AM PST I am currently looking to find out whether Radon gas is actually a danger in some homes (specifically in Norway) or whether the dangers are greatly exaggerated. I want to know because it will determine whether or not i can take a job as salesmen of devices that detect radon gas. I don't want to sell bullshit. [link] [comments]  |
| How far away is the andromeda galaxy ? Posted: 07 Dec 2016 03:27 AM PST I wonder how far away the andromeda galaxy is. I know that it´s 2.5 million light years away...but it´s coming in our direction. So how far away is the galaxy right now ? I mean during these 2.5 million years the andromeda galaxy should be way closer than 2.5 million light years right now right ? Even tho we can´t see it yet. So if the actual distance is x light years it would need x years for us to see the andromeda galaxy as it is right now right ? So again how far away is the galaxy right now or how far away would we see the galaxy in 2.5 million years ? [link] [comments]  |
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