I read that, on average, 3 supernovas will occur in the Milky Way galaxy every century. If that is the case why haven't we observed any since the last one in 1604? |
- I read that, on average, 3 supernovas will occur in the Milky Way galaxy every century. If that is the case why haven't we observed any since the last one in 1604?
- Does scratching at irritations like bug bites harm or delay the healing process at all?
- If microwaves and gamarays have the ability to travel through walls(both of which is on the opposite spectrum), why can't visible light?
- Could someone help me understand the dephasing during T2-decay?
- Why are fires primarily red? Why don't fires naturally burn violet or green?
- On an atomic or molecular level, what happens to food when it goes off?
- Some dogs and cattle have very similar coat patterns, is that controlled by the same gene?
- How strong is a single carbon nanotube?
- What is the effect of Jupiter's pull on the sun?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- I am floating in the center of a stationary ship in space. I throw a ball against the back wall. Does the ball cause the ship to move before I strike the opposite side?
- Are infections from species like Naegleriasis becoming more common?
- In terms of strength, how does caterpillar silk compare to spider silk?
- Why do rubber tires squeal on pavement?
- What is the name for the mixed particle that photons form when moving through a medium?
- Have all the Earth's crusts recycled to the mantle at some point?
- How do islands get internet?
- Why do magnets ruin computers and other electronic devices?
- Neutrinos vs. Photons: "Almost" the speed of light?
- Why Chile, Great Britain and Norway West coasts all look alike?
- In terms of colloidal stability is there a relation between colloid concentration and ion concentration?
- Why is mole defined as a fundamental quantity? Isn't it just a number of things like a dozen, or a trillion?
- How does a space rocket hold its angle of ascent during takeoff with no obvious points for correction - like the wings on a plane?
| Posted: 06 Sep 2016 10:20 AM PDT |
| Does scratching at irritations like bug bites harm or delay the healing process at all? Posted: 06 Sep 2016 07:58 PM PDT |
| Posted: 06 Sep 2016 08:54 AM PDT |
| Could someone help me understand the dephasing during T2-decay? Posted: 07 Sep 2016 06:08 AM PDT Could someone help me understand the dephasing during T2-decay which happens after the excitation of the magnetic vector in MRI? My concrete question is: Are the dephasing an expression of the single protons frequencies incoherence in the net magnetization vector, or is the incoherence happening in each proton? [link] [comments]  |
| Why are fires primarily red? Why don't fires naturally burn violet or green? Posted: 06 Sep 2016 08:36 PM PDT |
| On an atomic or molecular level, what happens to food when it goes off? Posted: 06 Sep 2016 07:59 AM PDT |
| Some dogs and cattle have very similar coat patterns, is that controlled by the same gene? Posted: 07 Sep 2016 06:10 AM PDT |
| How strong is a single carbon nanotube? Posted: 06 Sep 2016 09:59 AM PDT Let's say someone firmly anchors a single, continuous carbon nanotube across a hallway at neck height. I walk down the hallway. What happens when I reach the tube? Do I harmlessly break the tube? Do I get a cut to my neck? Do I get decapitated? Edit to say: I couldn't decide if this was a "physics" question or an "engineering" question. [link] [comments]  |
| What is the effect of Jupiter's pull on the sun? Posted: 06 Sep 2016 08:59 PM PDT So I'm watching a documentary (2008) that is talking about looking for other planets and how they watch a star to see if it "wobbles" because that would show the gravitational pull of planets orbiting that star. They go on to say Jupiter pulls the sun 0.5 a million miles side to side when it orbits. And it takes 12 years (presume earth years) to orbit the sun. Question1: is this still how we look for planets? And more importantly: Does this has an effect on the earth as we could end up with the sun closer to us if Jupiter is near us / on the same side of the sun than if Jupiter was opposite us for example? Like does it create warmer weather patterns or conversely colder patterns .. Or is 0.5 million miles not that much in reality? [link] [comments]  |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 07 Sep 2016 08:04 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology 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: 06 Sep 2016 12:14 PM PDT If the answer is no, due to this being a closed system. I ask why? If the ball strikes the back wall one second before I hit the other side and equalize the momentum, where is that 'lost force' from the ball hiding at? If you say it does move, but then I hit the front wall to balance the force out, where I am still in the original spot then my question is this: The ball hit the wall, the spaceship moves 10 feet backward. I am now floating toward the front and hit the front wall to impart the force to go the opposite direction 10 feet. What would cause the ship to decelerate and make the net movement zero? [link] [comments]  |
| Are infections from species like Naegleriasis becoming more common? Posted: 07 Sep 2016 07:23 AM PDT Or are we just hearing about them more? Story which made me think of this: http://www.dailyfreeman.com/general-news/20160901/rare-infection-suspected-in-death-of-19-year-old-from-kingston But I believe there are others we've all heard about -- flesh eating bacteria. Also, if this amoeba entered her sinuses, basically anyone is vulnerable, correct? So open wounds, etc does not matter? [link] [comments]  |
| In terms of strength, how does caterpillar silk compare to spider silk? Posted: 06 Sep 2016 08:03 PM PDT |
| Why do rubber tires squeal on pavement? Posted: 06 Sep 2016 09:34 PM PDT Why do rubber tires make that distinctive squealing noise? What physical properties cause this? [link] [comments]  |
| What is the name for the mixed particle that photons form when moving through a medium? Posted: 06 Sep 2016 06:29 PM PDT So I know that the absorption/emission explanation for light slowing down in a medium is wrong, and I somewhat understand the other explanation. But for the life of me I can't recall what exactly the quasi-particle that is formed during the interaction is called. I've checked the FAQ on the subject, but the only names I've found are "polariton" and "phonon", which I don't remember reading in previous explanations. Is there another name, or is my memory just faulty? [link] [comments]  |
| Have all the Earth's crusts recycled to the mantle at some point? Posted: 06 Sep 2016 08:01 PM PDT |
| Posted: 06 Sep 2016 07:41 PM PDT |
| Why do magnets ruin computers and other electronic devices? Posted: 06 Sep 2016 08:07 PM PDT |
| Neutrinos vs. Photons: "Almost" the speed of light? Posted: 06 Sep 2016 05:06 PM PDT Photons have zero rest mass, therefore they move at the speed of light. Neutrinos, on the other hand, do have a rest mass, although very small. Is there a rule at super light masses, that particles are required to move at relativistic speeds? It seems like the difference between .99999999c and c is still basically infinite. I can't wrap my mind around this. Any help is welcome. [link] [comments]  |
| Why Chile, Great Britain and Norway West coasts all look alike? Posted: 06 Sep 2016 09:31 PM PDT I just noticed on google maps that Chile, Great Britain and Norway west coasts all look alike. They have those canals infiltrating the mainland. is there any geological reason for this or is it just coincidence? why can't i find any major cost like this facing East on the globe? sorry for my english. [link] [comments]  |
| Posted: 07 Sep 2016 12:34 AM PDT Lets say we have a colloid at a concentration of 5 wt% and we know the suspension becomes unstable in an electrolyte with a total ion concentration of 10 mM (arbitrary numbers), then can we predict what ion concentration a 0.5 wt% suspension will be? Will it be 100 mM (I doubt it). I assume the colloid will be more stable at higher concentrations because even though the Debye length for a given particle will be smaller, there is a smaller probability of a given particle interacting with another. [link] [comments]  |
| Posted: 06 Sep 2016 01:19 PM PDT Further, why does it even have a dimension? Everywhere it seems to be explained to think of it just like a number of entities, then why does it have a dimension and called a fundamental quantity? [link] [comments]  |
| Posted: 06 Sep 2016 11:29 PM PDT I'm always baffled how the SpaceX rockets hold such a straight line with so much thrust on the back. [link] [comments]  |
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