Why is the Universe’s “local” geometry (e.g. on the surface of the Earth) so similar to Euclidean geometry? |
- Why is the Universe’s “local” geometry (e.g. on the surface of the Earth) so similar to Euclidean geometry?
- Is there still Gs aka Artificial Gravity after a hard burn with no deceleration in space?
- How far from earth do you have to be when you change from perpetual free fall going around the earth to being in zero gravity?
- Why does anomeric hydroxyl group of Glucose and Fructose undergo methylation but others OH groups dont?
- A gallon of jet fuel burned creates 21 pounds of CO2. How can that be when jet fuel only weighs 6.8 lbs per gallon?
- How does living in a near-lightless environment effect things like the pigmentation and color of deep sea creatures?
- Blast wave speed limited by the speed of sound?
- Does vision have varying "framerates" based on light conditions or similar?
- How do natural whirlpools occur?
- What happens to a gravitational wave when it crosses a black hole ?
- Why are our voices deeper in slow motion?
- Why doesn't downscaling work?
- If there was a hole in the perfect center of the earth (like ~7-8 ft diameter) and you were in it, how would gravity affect you?
- Are all the noble gases conductors of electricity?
- How do we know that distant galaxies aren't made of anti-particles?
- Was there any snow in the arctic during the Paleocene during the winter solstice?
- what happens to deposits of heavy metals in an animal's fat tissue when the animal is starving?
| Posted: 23 Sep 2019 12:46 AM PDT I'm not sure if the wording of my question is correct or clear enough; I'll try to elaborate more below. Also, I apologize if I'm inaccurate or unclear in what I say below too; I just started reading about this. From what I've gathered/understood from articles and more-or-less nontechnical books on general relativity, it seems as if the "global" geometry of the Universe is not Euclidean, implying things like the shortest distance between two points in space is not a straight line. However, here on Earth, the path of shortest distance between two points (even if they are separated by the Earth itself) is almost indistinguishable from a straight line. I'm wondering why this is the case. [link] [comments]  |
| Is there still Gs aka Artificial Gravity after a hard burn with no deceleration in space? Posted: 23 Sep 2019 12:23 AM PDT I was watching Ad Astra and their trip to Mars from the Moon was 7 weeks. So when they launched they didn't look like they did a deceleration and drifted the rest of the way to Mars. I was wondering if they will still be feeling the Gs instead of happily floating around in the space craft. [link] [comments]  |
| Posted: 22 Sep 2019 10:52 PM PDT |
| Posted: 23 Sep 2019 06:00 AM PDT |
| Posted: 22 Sep 2019 05:35 PM PDT There should be an r/nostupidsciencequestions subreddit out there... I never took a chemistry class, so maybe I'm missing something basic. Using the numbers from here: https://www.eia.gov/environment/emissions/co2_vol_mass.php, I see that burning a gallon of jet fuel creates 21.1 pounds of Co2. But a gallon of jet fuel only weighs about 6.8 lbs/gal. I would think that the act of burning fuel and using the heat and pressure of the combustion would result in less total byproduct, not more than triple it. What am I missing? [link] [comments]  |
| Posted: 23 Sep 2019 03:15 AM PDT Maybe a weird ask, so bear with me! I'm painting some miniatures of underwater creatures like turtles and sharks and what have you for a game I play, and I want to paint them as if they live (the majority of their time) in a lightless environment, drawing on real world deep sea creatures and pigmentation for comparison! My biggest concerns are things like pattern and general color. I know that, over time, many sea creatures like sharks and some fish have evolved white under bellies and dark backs, because if predators looked from above they would see the back blend in with the surroundings, and if they looked from below they would see the underbelly blend in with the sunlight. Is that type of biology functional or even present in a deep sea habitat? What about patterns meant to evoke warning or confusion, like the vibrant colors of a lion fish or the stripes on a tiger shark? Concerning color, I'm interested to get an idea of the types of colors (or lack thereof) generally exhibited by animals in the deep sea. Even though there's no/little light, there skin still probably reflects some color when light is introduced, yeah? I'd appreciate any insight! [link] [comments]  |
| Blast wave speed limited by the speed of sound? Posted: 23 Sep 2019 05:35 AM PDT Is it possible for a blast wave to exceed the speed of sound? [link] [comments]  |
| Does vision have varying "framerates" based on light conditions or similar? Posted: 23 Sep 2019 04:32 AM PDT I walked in my livingroom this morning in the almost pitch black. All of a sudden i see a long black line charging towards me and then i see it go straight up. It was my cat, but in my vision the cat was 6-7' until it stopped moving. Is that due to my mind having to work harder to process information? Is it because your visual cones have to do things before they work again? Why did my cat look so big in very low light conditions? Is there any other weird things your eyes do in the right conditions? [link] [comments]  |
| How do natural whirlpools occur? Posted: 22 Sep 2019 03:41 PM PDT |
| What happens to a gravitational wave when it crosses a black hole ? Posted: 22 Sep 2019 10:01 AM PDT |
| Why are our voices deeper in slow motion? Posted: 22 Sep 2019 09:43 AM PDT |
| Posted: 22 Sep 2019 10:47 AM PDT When doing a lab scale version of a big scale/production scale process, why is it so hard to get the same results? For me it makes sense that if you perform a chemical prosess in a small scale laboratory (ie downscaling it) you will get the same result as in larger scale? [link] [comments]  |
| Posted: 22 Sep 2019 12:15 PM PDT |
| Are all the noble gases conductors of electricity? Posted: 22 Sep 2019 08:00 AM PDT |
| How do we know that distant galaxies aren't made of anti-particles? Posted: 22 Sep 2019 06:40 AM PDT Considering how far away things are from each other in the universe, would we be able to see the difference if a galaxy was completely made of antimatter? [link] [comments]  |
| Was there any snow in the arctic during the Paleocene during the winter solstice? Posted: 22 Sep 2019 09:32 AM PDT I've read that the arctic was "ice free" during the Paleocene Epoch. Really? Even during polar night? Was there any snow? [link] [comments]  |
| what happens to deposits of heavy metals in an animal's fat tissue when the animal is starving? Posted: 22 Sep 2019 08:18 AM PDT Large predators such as whales or even humans can accumulate deposits of heavy metals (usually lead or mercury) in their fat tissue as a result of eating contaminated prey. But what happens when the animal loses the fat tissue? [link] [comments]  |
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