Is the age of the universe a matter of perspective? |
- Is the age of the universe a matter of perspective?
- Why are the decks angled on aircraft carriers?
- Could a solar sail spacecraft carry its own laser emitter to provide propulsion or does a laser push its own emitter backwards?
- Why doesn't the flu vaccine contain more than four strains?
- why some planets have magnetic field while others don't?
- What were the pressing questions for biology in the 60s?
- What happens with the CBR when you move?
- How is amplitude related to energy?
| Is the age of the universe a matter of perspective? Posted: 13 Sep 2021 08:56 AM PDT When it's said that the universe is 13.8 billion years, isn't that from the gravitational perspective of earth? Like if life could survive in a planet around a black hole would the perspective of the age of the universe be much older? I get the Big Bang happened at one time and that that point in time is the same no matter where you are, but theoretically couldn't there be a species of life that could experience 100s of billions of years and view the universe as much older? Addon: wow this kinda blew up. Thanks for all the info. The way I was thinking about the perceived time is backwards. It really does make sense when you think about it. There was always something about what I was thinking that seemed off. So thank you all very much. [link] [comments]  |
| Why are the decks angled on aircraft carriers? Posted: 14 Sep 2021 12:03 AM PDT In addition to a few YouTube short-umentaries on the subject, I have read a couple shorter articles on the reasons for angled decks , but I am apparently lacking the big brain here. Every source seems to assume you "get it" and doesn't break it down far. I understand how rotating the deck from 90 to ~45 degrees could extend the usable length, but I don't get why the carrier couldn't just be made larger or what other benefits there are (beyond the added length) that you wouldn't also have on a straight/90-degree/"old" deck. [link] [comments]  |
| Posted: 13 Sep 2021 08:08 AM PDT There's a classic physics problem that asks why we don't put fans on our sailboats to power our boats when there's no wind? The obvious answer is that the fan will always provide equal or more impulse in the opposite direction than it provides to the sail. Does this same principle apply to solar sails? If you had lasers on the back of a space ship pointed at solar sails in the front, would you move or would you end up stuck in place, i.e. do lasers apply a force back onto their emitters? If they do, much like how you can have a fan boat that just uses the fan for propulsion, no sail involved, could you just power a spaceship by just firing lasers in the opposite direction? I get that this kind of defeats the purpose of solar sails which are supposed to be super light and capable of traveling without needing a power source that could run out of energy. Plus solar sails would either be powered by the sun or massive solar arrays on earth which would provide much more energy and impulse than what the ship could carry with it. I'm more just asking from more of a theoretical standpoint than a practical one. [link] [comments]  |
| Why doesn't the flu vaccine contain more than four strains? Posted: 13 Sep 2021 08:52 PM PDT So I get that the flu vaccine is a quadrivalent vaccine and it's made up of what the doctors hypothesise will be the top 4 variants/strains. But why only 4? Why not the top 5 most likely? Why not 10? Is there a logistical issue for the flu vaccine to contain more strains? Is there concern for greater potential impact on the body if the vaccine had more variants/strains in the same vaccine? [link] [comments]  |
| why some planets have magnetic field while others don't? Posted: 14 Sep 2021 01:57 AM PDT |
| What were the pressing questions for biology in the 60s? Posted: 13 Sep 2021 03:34 PM PDT |
| What happens with the CBR when you move? Posted: 13 Sep 2021 11:43 PM PDT Ok, so I understand there's no such thing as absolute motion, you always need a frame of reference to determine your velocity. But the cosmic background radiation is pretty much the same in any direction you care to look, right? So assume a frame of reference in which you are currently stationary. Now start moving in any given direction. Will the CBR coming from ahead of you be blue shifted and the CBR behind you red shifted? If no, why not? And if yes, wouldn't measuring the red/blue shift of the CBR give you an absolute measure of velocity? [link] [comments]  |
| How is amplitude related to energy? Posted: 13 Sep 2021 09:04 AM PDT E=hv where h is a constant or E=hc/λ where c is also a constant, but two waves with the same v or λ are not equal in energy if they have different amplitudes...help? [link] [comments]  |
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