Why is the absorbtion spectra from stars not cancelled out by re-emission? |
- Why is the absorbtion spectra from stars not cancelled out by re-emission?
- Do we know whether the newest Covid mutations in the UK and South Africa are indeed the same virus (i.e. a traveller from either brought it to the other) or if we are dealing with two independently mutated stains that just happen to coincidentally manifest around the same time?
- Is it possible that the "new" strain of Covid-19 emerge because of natural selection?
- Why do asteroid trajectories have such a large window of uncertainty?
- Difference between antibodies made after infection and antibodies made after vaccination?
- After infection, does constant exposure to virus maintain a higher antibody level?
- How do mRNA vaccines avoid being chopped up by the human body's cell enzymes?
- What do the other proteins (besides the spike protein) in Sars-Cov-2 do?
- Why does fatigue actually occur?
- Can we predict covid 19 mutations?
- If super novas can be brighter and more powerful than other supernovas, how exactly is it that they can act as "standard candles" for gauging distance and such?
- When traveling at relativistic speeds, an objects total kinetic energy increases, but the mass remains the same within its own frame reference. What about relative to an observer? Would the mass appear to increase, therefore have greater gravitational effects on them?
- Is it possible to do blood tests using FTIR spectrometer?
- 70% is the number thrown around for heard immunity. Does that take into account the larger percentage of people who in today's age are isolating and working from home?
- Can people develop immunity to a disease without ever becoming infected?
- Will the already developed COVID vaccines work against the new strain that supposedly popped up in the UK?
- At what scale does liquid shear become a relevant phenomenon?
- Has any of the COVID-19 vaccines potential to be used as treatment after early symptoms?
- What changes in the body when you build up stamina?
| Why is the absorbtion spectra from stars not cancelled out by re-emission? Posted: 21 Dec 2020 04:51 AM PST I have done some googling on this topic but I haven't found a definite answer. I know that atoms in stars can absorb photons of certain wavelengths and that these atoms can re-emit these photons. So the answer I usually read on this particular question is that while the light from the sun has to travel in a certain direction to reach the earth, the photons of a particular wavelength can be absorbed and re-emitted in every possible direction so that the amount of photons from that particular wavelength that reaches the earth is less than the other wavelengths. So here's my question: While the above is true for light traveling through a small region of a star, there have to be other regions in the sun that would send their light to a different part of the universe than our earth but their absorbed and re-emitted light can also be scattered in all directions so some of that light could be re-emitted in our direction when it otherwise wouldn't (without absorption and emission). So wouldn't all these regions cancel each other out? We receive less light from a particular wavelength from a certain region from the sun, but we also receive some light of that wavelength from other regions of the sun that don't send their light of "normal wavelengths" to us? If this wasn't true, where would these photons go? They can't just dissapear right? What am I missing here? [link] [comments]  |
| Posted: 21 Dec 2020 02:35 AM PST Local government has shut down travels to and from both the UK and South Africa over the new Covid mutation highlighted by the UK government. While I did know the UK mutation was a thing, I was quite surprised by the addition of South Africa. If it's the same virus, shouldn't we assume it's already spread from the UK to mainland Europe (I mean, what's the chance it spread from the UK all the way down to South Africa, but not to any countries in-between?) and shut down travel between countries until we know where it will show up? [link] [comments]  |
| Is it possible that the "new" strain of Covid-19 emerge because of natural selection? Posted: 21 Dec 2020 01:52 AM PST I read somewhere on reddit that the 'new' strain of Covid-19 can transmit to people even when using proper PPE. Yes I know that virus is mutating because DNA replicating is not perfect, but is it possible that we also helped the virus evolves faster to be more transmissible? Imagine millions or billions of people using mask, and the fact that mask can not 100% stop the virus transmission while they are allow to gather. Maybe because of that it allowed the virus with high transmission rate to survive better than virus that have low transmission rate. Just like if we don't complete our antibiotics course and allowed stronger bacteria to survive. or like the peppered moth evolution. Sorry for any spelling mistake, English is not my first language. [link] [comments]  |
| Why do asteroid trajectories have such a large window of uncertainty? Posted: 21 Dec 2020 04:54 AM PST It seems like whenever a near earth asteroid comes on a close track with Earth, there is a huge amount of uncertainty in the trajectory, despite weeks, months, of years, of being able to record its past trajectory. Why? If we know exactly how fast it is going, exactly where it is, and (pretty much) exactly on what path, why don't we know exactly where it is going to end up? [link] [comments]  |
| Difference between antibodies made after infection and antibodies made after vaccination? Posted: 20 Dec 2020 05:59 PM PST When someone is infected by Covid-19 what part(s) of the virus does their immune system make antibodies against? I'm aware that the mRNA vaccine will be translated into the spike protein so that our immune system will make antibodies against that. I'm assuming that when getting infected by the virus our bodies make antibodies against numerous parts of the virus. But considering antibodies only protect people for a few months, it probably targets parts of the virus that mutate very often and the amount of spike protein antibodies made are too few to offer lasting protection? [link] [comments]  |
| After infection, does constant exposure to virus maintain a higher antibody level? Posted: 20 Dec 2020 03:34 PM PST Im currently waiting to get my covid result and half of the staff at the facility I'm at are not wearing mask. I ask a staff member that was wearing a mask and her response was they've already had covid and want to keep their antibodies up. [link] [comments]  |
| How do mRNA vaccines avoid being chopped up by the human body's cell enzymes? Posted: 20 Dec 2020 12:10 PM PST I read this passage in a NYT article:
How does this work? What is it about particular strands of mRNA that makes them accessible for protein production but also prevents them from being destroyed for a while? [link] [comments]  |
| What do the other proteins (besides the spike protein) in Sars-Cov-2 do? Posted: 20 Dec 2020 06:16 PM PST |
| Why does fatigue actually occur? Posted: 20 Dec 2020 02:04 PM PST When a material fatigues it can be operating at a low load but because of the constant loading and unloading on the material it eventually develops a tiny microfracture that grows and eventually results in a catastrophic failure. I can't find a straight answer for why this happens, why does the fracture occur, why do the molecular structures deform inside the material as work is done on them and why does the material go from being perfectly strong to suddenly critically failing. Every answer I can find explains what happens but not why those things happen, what is happening at the molecular level to cause these failures [link] [comments]  |
| Can we predict covid 19 mutations? Posted: 21 Dec 2020 01:20 AM PST If we know the virus' genetic sequence, can we predict the probability of each possible mutation and its consequences? Can we find the likelihood for a change in the virus structure, that leads to it becoming no longer vulnerable to preexisting antibodies? Can we calculate the probability for a sequence change that might lead to the vaccine being obsolete to the mutated strain? [link] [comments]  |
| Posted: 20 Dec 2020 11:15 AM PST https://www.youtube.com/watch?v=dhjHs2L4kqw Came across this video describing a supernova that was recorded as being 10 times bigger and 500 times brighter than any previously known supernova. I always heard that we use supernovas to gauge distances as they can act as "standard candles" when charting the universe and our galaxy. But if supernovas can vary in brightness and size so much, how can they be used as a "standard" of anything? [link] [comments]  |
| Posted: 20 Dec 2020 10:01 AM PST I'm having some trouble wrapping my head around this. I'm not even sure if my initial statement that the mass of a relativistic object doesn't change within its own frame reference. I understand that rest mass of an object is invariant and doesn't change between observers. But this still begs the question regarding objects at relativistic speeds since M would still equal the kinetic energy / c2 (at least I think). This means the relativistic mass of an object would increase (to an observer), therefore its gravitational effects should correlate to its relativistic mass to an observer. Ultimately I'm wondering if an object with mass zips by an observer at relativistic speeds, would that observer feel the effects of gravity for the object's mass plus the kinetic energy/c2 ? [link] [comments]  |
| Is it possible to do blood tests using FTIR spectrometer? Posted: 20 Dec 2020 02:24 PM PST Hey guys, Im kind of lost and confused so i recently acquired a FTIR spectroscope and UV vis spectrometer as well. Basically im testing the water in my area daily. I was wondering what tests i could run on blood samples with these devices? [link] [comments]  |
| Posted: 21 Dec 2020 04:50 AM PST It seems to me that the herd immunity percentage should account for the social population (those interacting with society) and not the overall population. [link] [comments]  |
| Can people develop immunity to a disease without ever becoming infected? Posted: 20 Dec 2020 11:52 AM PST What if someone is repeatedly exposed to some contagion, but every time just ingests only very few bacteria/viruses that the immune system can handle without any issue. Wouldn't they develop some immunity eventually? [link] [comments]  |
| Posted: 20 Dec 2020 02:51 PM PST |
| At what scale does liquid shear become a relevant phenomenon? Posted: 20 Dec 2020 12:50 PM PST I'm wondering if this can happen on the quantum level. Like for example if you had a magnetic non-neutonian fluid with graphene in it. Could the kinetic energy from radiation trigger the effect in the material? Forgive me if this is a silly question. My daughter is obsessed with slime videos so I started wondering about graphene in such a fluid to keep myself sane. [link] [comments]  |
| Has any of the COVID-19 vaccines potential to be used as treatment after early symptoms? Posted: 20 Dec 2020 10:44 AM PST I know that the rabies vaccine is also used to prevent the disease after exposure to the pathogen. What about some COVID-19 vaccine that could effectively and accurately teach body defences very fast, like before the virus could fully take over the lungs? [link] [comments]  |
| What changes in the body when you build up stamina? Posted: 20 Dec 2020 05:56 AM PST In other words, if two people with identical body weight fat and muscle, but one has better stamina, what lets one person run further? [link] [comments]  |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
No comments:
Post a Comment