If the universe is (generally speaking) flat, how come, as seen from telescopes, nothing lies on a single plane? Images of the CMB aren't 3D models, so why do we see galaxies in every direction? |
- If the universe is (generally speaking) flat, how come, as seen from telescopes, nothing lies on a single plane? Images of the CMB aren't 3D models, so why do we see galaxies in every direction?
- Is the speed of gravity constant?
- How I can I picture a radio wave in 3d space?
- How did terrestrial animals and insects like Mongoose and Spiders get to islands far from land like Hawaii or Guam?
- Supermassive black hole accretion rates, are they constant?
- If sex steroids pass through all cells, how can only one follicle be matured and one egg released at a time for women in the menstrual cycle?
- What is “Cosmic Background Radiation”?
- Are (metallic) superconductors good mirrors?
- Can you squeeze an electron?
- Do Bees differentiate types of pollen/show a preference for one type of flower over another or is it all functionally the same to them?
- In the many-worlds theory of QM, is there a theory of how many universes branch of from a single quantum observation?
- What size/speed/density would a meteor have to be to fly through Jupiter?
- Do the laws of thermodynamics apply to subatomic phenomena?
- Why do height requirements exist for some rides and what studies have been done to determine the standards?
- Does every closed system have a maximum and minimum value of entropy?
| Posted: 26 May 2018 03:35 PM PDT |
| Is the speed of gravity constant? Posted: 26 May 2018 05:03 PM PDT So I know that gravitational waves travel at the speed of light (in a vacuum) but are there circumstances where the speed of gravity changes? If so what are these circumstances? [link] [comments]  |
| How I can I picture a radio wave in 3d space? Posted: 26 May 2018 03:58 PM PDT I only ever see them depicted as sine waves online, but my guess would be that 'sine waves' are to radio waves as what '12' is to a carton of eggs. Is it possible to picture how they are around me in my environment? [link] [comments]  |
| Posted: 26 May 2018 11:14 AM PDT |
| Supermassive black hole accretion rates, are they constant? Posted: 26 May 2018 04:28 PM PDT This article: http://www.astronomy.com/news/2018/05/snapshot-second-gaia-release-results-so-far states that we have found a supermassive black hole of 20 billion solar masses 12 billion light years away that is accreting at the rate of 1% every million years. That rather sounded like a compound interest statement, so I plugged the numbers into a calculator to figure out how large it would be after 12 billion years (now), and got 143,719,397,330,047,128,616,744,826,647,657,321,145,325,176,127,225,856 billion solar masses. That seems like a lot. Do we expect it to have stopped it's accretion at some point, or is the article miss-stating that fact (it also breaks it down as solar masses per day). Also, what's the Schwarzschild radius of something that massive? [link] [comments]  |
| Posted: 26 May 2018 11:27 AM PDT |
| What is “Cosmic Background Radiation”? Posted: 26 May 2018 11:34 AM PDT |
| Are (metallic) superconductors good mirrors? Posted: 26 May 2018 09:31 AM PDT I recently gained the insight that mirrors work because the electrons in the metal sheet, when an photon hits, move until their electric field is equal in strength to the photons electric field, creating the reflected oscillating field- a reflected photon. The electrical resistance of the material hampers this flow to create an opposing field. So I wonder whether superconductors, having no resistance, are mirrors, and if they are, how good they are? Are all superconductors mirrors, or only ones made of specific materials? Do they reflect all wavelenghts equally? TL;DR: Learned resistance makes mirros worse, asking if superconductors are great mirrors. P.S. If you find my english objectionable, not my first language. [link] [comments]  |
| Posted: 26 May 2018 08:22 AM PDT Can you squeeze an electron and make its volume smaller? This question came into my mind when I've heard that "If you remove all the space in the atoms, the entire human race could fit in the volume of a sugar cube". But to create a black hole, you would need to compress them in a smaller volume. So the conclusion is : black holes suqeeze electrons/protons. Is this true? [link] [comments]  |
| Posted: 26 May 2018 11:56 AM PDT |
| Posted: 26 May 2018 06:22 AM PDT Here are 3 examples that getting answers for might clear things up. First is a fundamental uncertainty: let's say the universe consists of one electron, whose spin equally likely up or down. You observe it. Does the universe branch into two universes, one for each option? Or infinite universes, with half at spin-up and half at spin-down? Next is a case where maybe the outside world matters: Let's say there's an electron, and an potential barrier, and the electron has a 50% chance of tunneling through it. When you observe it, does the universe split into two branches? Or infinite? Finally, let's say the same electron has some irrational chance of tunneling through (lets say sqrt(3) chance). When you observe it, what exactly happens? I can't see how the universe would split into a finite amount of states after this. The reason I ask about spin AND tunneling is, I don't know if many-worlds reasoning only applies to fundamental observations, or system-observations. As a follow-up question: when people who know what they're talking about think about this stuff, do they picture universes being created for each decision, or two universes that were sitting on top of each other to begin with, diverging? [link] [comments]  |
| What size/speed/density would a meteor have to be to fly through Jupiter? Posted: 26 May 2018 04:24 AM PDT |
| Do the laws of thermodynamics apply to subatomic phenomena? Posted: 26 May 2018 05:53 AM PDT I was studying thermodynamics for my materialsscience course and I started to wonder. It is assumed in thermodynamics that energy is constant but I guess you could look at the fission of a nucleus as chemical reaction. Not sure, what do you think? [link] [comments]  |
| Posted: 26 May 2018 09:50 AM PDT |
| Does every closed system have a maximum and minimum value of entropy? Posted: 25 May 2018 11:00 PM PDT |
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