Can stars exist that are arbitrarily close to becoming a black hole? |
- Can stars exist that are arbitrarily close to becoming a black hole?
- If gravity "travels" as a wave, does it move at the speed of light?
- Why don't solids sublimate in space?
- If a person is a blood-type match for a blood transfusion, would they also be a match for bone marrow or organ donation?
- Are protons from different elements identical?
- Why do some chemical elements with a higher atomic number than the preceding element have a lower weight? (E.g. Argon has atomic number 18 and weight 39.948, and Potassium has atomic number 19 and weight 39.0983.)
- Why aren't there any medical uses of exoenzymes?
- [Computing] How to compute the determinant of a large matrix with optimal precision?
- Salt Water Crocodiles are said to have changed very little since 'dinosaurs roamed the earth,' is this exclusively because of their apex position in the food chain, or do their offspring show a lower rate of genetic mutation?
- Why do hard drives not hold their specified storage amount?
- Could black holes have been predicted using Newton's laws?
- Are there any animals that make tools for the purpose of improving or refining other tools?
- Do people with hyperthymesia remember dreams better than the average person?
- What is the evidence for circular indentations in the front of frills of ceratopsians?
- How does the human body notice that you have digested foul or poisonous food & how long does it take to launch countermeasures?
- (Mathematics) Does the sum of all real numbers equal -1\12?
- [physics] Assuming earth was a perfect sphere, how far off the surface would the light have to pass in order to orbit it?
- Does white noise have any effect on concentration or memory?
- If 0*0=0, wouldn't that mean that 0=0/0?
- How do we know that action must be least ( stationary ) ?
| Can stars exist that are arbitrarily close to becoming a black hole? Posted: 29 Oct 2016 10:21 PM PDT That is, can the radius of a star be arbitrarily close to the Schwarzchild radius for its mass? Or is there a certain radius past the Schwarzchild radius below which a stable star cannot exist, and the star must collapse into a black hole? [link] [comments]  |
| If gravity "travels" as a wave, does it move at the speed of light? Posted: 29 Oct 2016 06:09 PM PDT In science we were all taught that all matter has mass, and thus gravity. That gravity extends across the entire universe, and gets weaker the further you are from the center of mass. So, since LIGO has detected gravitational waves, how fast do those waves move? Do they "travel" at the speed of light and behave the same as any other electromagnetic wave? [link] [comments]  |
| Why don't solids sublimate in space? Posted: 29 Oct 2016 07:38 PM PDT There's basically zero vapor pressure in space so shouldn't things spontaneously turn to gas? [link] [comments]  |
| Posted: 29 Oct 2016 08:37 PM PDT |
| Are protons from different elements identical? Posted: 29 Oct 2016 06:04 PM PDT Here's what I understand: Atoms are made of protons, neutrons and electrons. What differentiates elements from each other is the number of protons contained within their atoms. E.g.; Hydrogen only has one proton, whereas Neon has 10 protons, Calcium has 20 protons, etc. But here's what I don't get: if you took the proton from an atom of hydrogen, and compared it to a proton taken from Calcium, would they be identical? Put another way, do the subatomic particles of hydrogen have an intrinsic 'hydrogen-ness' to them, or are they entirely interchangeable with the particles of other elements? Could you theoretically remove a proton from a Calcium atom, and replace it with a proton from a Cadmium atom and still have an atom of 'pure' Calcium? Thanks in advance [link] [comments]  |
| Posted: 29 Oct 2016 02:00 PM PDT Other examples include Thorium with atomic number 90 and weight 232.0377 and Protactinium with atomic number 91 and weight 231.03; Uranium with atomic number 92 and weight 238.02 and Neptunium with atomic number 93 and weight 237; and Bohrium with atomic number 107 and weight 272 and Hassium with atomic number 108 and weight 270. My understanding was that as the atomic number goes up, so does the number of protons, so shouldn't the weight always go up as more protons are added to a nucleus? [link] [comments]  |
| Why aren't there any medical uses of exoenzymes? Posted: 29 Oct 2016 03:14 PM PDT It seems that some exoenzymes could be really clinically useful in targeting particular kinds of cancer - hyaluronidase, which breaks down the packing tissue between cells, delivered to cancerous tumors was just something that I thought of. Or why not use leukocidins to treat autoimmune disorders? I asked my microbiology professor, and she said she didn't know of any clinical applications, so I thought I'd ask here why/if that's the case. Thanks! [link] [comments]  |
| [Computing] How to compute the determinant of a large matrix with optimal precision? Posted: 29 Oct 2016 08:05 PM PDT For a cluster computing competition a couple years back, the challenge was to compute the determinant of a 5000x5000 square matrix (25,000,000 elements) consisting of double-lengths integers. My original idea was to row reduce the matrix and multiply the diagonal, but that seems like it would run into problems with the sheer quantity of multiplication that would need to occur leading to a reduction of precision. The goal of the competition was to be "accurate" (but that wasn't really defined very well) and to be the quickest to this "accurate" result. What methods would provide a quick and reliable answer, Reddit? [link] [comments]  |
| Posted: 29 Oct 2016 07:29 AM PDT As in the title, 'lower rate' as compared to higher mammals, which developed more recently. [link] [comments]  |
| Why do hard drives not hold their specified storage amount? Posted: 29 Oct 2016 07:49 PM PDT I've bought a couple of hard drives for my electronics (i.e. Xbox and PC), but they never hold the correct amount of storage. Example: I bought a 500 gb hard drive for my PC, but it can only hold 232 gigs. Why does this happen? How can I fix this? [link] [comments]  |
| Could black holes have been predicted using Newton's laws? Posted: 29 Oct 2016 09:21 AM PDT |
| Are there any animals that make tools for the purpose of improving or refining other tools? Posted: 29 Oct 2016 09:28 AM PDT I know that tool construction has been observed in animals in the wild (IIRC by Jane Goodall), but that was single construction to get food. What about making a tool to make another tool better? [link] [comments]  |
| Do people with hyperthymesia remember dreams better than the average person? Posted: 29 Oct 2016 09:29 AM PDT Just curious if the memory loss of dreams is consistent throughout all humans. [link] [comments]  |
| What is the evidence for circular indentations in the front of frills of ceratopsians? Posted: 29 Oct 2016 09:00 AM PDT Many paleoartists have recently depicted ceratopsians with circle indentations in the front of their frills. There are circular openings in the bone in some cases - in Torosaurus, for example - but what is the evidence for there being indentations in the skin? Also, what is the evidence for the indentations in the front of the snouts that many paleoartists depict? [link] [comments]  |
| Posted: 29 Oct 2016 08:33 AM PDT |
| (Mathematics) Does the sum of all real numbers equal -1\12? Posted: 29 Oct 2016 03:26 PM PDT It was under my impression that you could not do arithmetic with inifinity or infinite sums for that matter, so all the proofs showing that the sum of all numbers equals -1/12 seemed kind of bogus to me. However I've heard that it's very important to string theory, so I'm kind of lost. Does it or doesn't it equal -1/12? Thanks. Edit: some grammars [link] [comments]  |
| Posted: 29 Oct 2016 09:39 AM PDT Basically can light orbit earth and if so, is it possible to detect? Or does the landscape render that outcome void? [link] [comments]  |
| Does white noise have any effect on concentration or memory? Posted: 29 Oct 2016 12:43 AM PDT If so, is this effect quantifiable in any way? Are there changes in brain activity when studying with or without the presence of white noise? [link] [comments]  |
| If 0*0=0, wouldn't that mean that 0=0/0? Posted: 29 Oct 2016 11:50 AM PDT If not clear: [link] [comments]  |
| How do we know that action must be least ( stationary ) ? Posted: 29 Oct 2016 06:00 AM PDT There are a lot of explanations on how to minimize the action and that newtonian and lagrangian mechanics give the same answer, but how do we know that action must be least ? Can it be shown that newtonian mechanics somehow implys that action must be least ? ( sorry for my english ) ? [link] [comments]  |
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