Why are the largest black holes we know of so far away from us? |
- Why are the largest black holes we know of so far away from us?
- How to understand that Godel's Incompleteness theorems and his Completeness theorem don't contradict each other?
- How does chickenpox keep re-appearing if it's so hard to get it twice?
- How did the Suez Canal and the Panama Canal affect the local ecosystem in their area?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- How does Yersina Pestis cause three separate, all fatal diseases?
- When were carbon dioxide measuring devices first invented?
- How do we differenciate between dark matter and black holes?
- How do the nodes of Ranvier (myelin sheath gaps) allow for the faster propagation of action potentials?
- What does high level mathematical study give us?
- Do covid-19 challenges to vaccinated subjects increase or decrease antibody titers in serum?
| Why are the largest black holes we know of so far away from us? Posted: 04 Aug 2021 02:16 AM PDT The YouTube channel Kurzgesagt recently uploaded a video on some of the largest known black holes, and I noticed that most of the larger ones they discuss seem to also be the furthest away. OJ 287 and TON 618 are both in the billions of light-years away from us. As we look into the distant universe, we are also looking back in time, due to the time it takes the light to travel to us from there. Therefore, we are seeing these ultramassive black holes as they were billions of years ago. But black holes, as far as we understand them, tend to only grow over time. Shouldn't we therefore expect to see smaller black holes when we look back in time, and larger black holes closer to the present, nearer to us? [link] [comments]  |
| Posted: 03 Aug 2021 10:01 AM PDT As a layman, it seems that his Incompleteness theorems and completeness theorem seem to contradict each other, but it turns out they are both true. The completeness theorem seems to say "anything true is provable." But the Incompleteness theorems seem to show that there are "limits to provability in formal axiomatic theories." I feel like I'm misinterpreting what these theorems say, and it turns out they don't contradict each other. Can someone help me understand why? [link] [comments]  |
| How does chickenpox keep re-appearing if it's so hard to get it twice? Posted: 03 Aug 2021 04:44 PM PDT All the comparisons of Delta COVID to chickenpox in terms of communicability made me wonder - if almost everyone gets chickenpox as a child and is then immune, how does it keep coming back? There must be a vector for it, I mean there has to be one kid who gets it and gives it to the rest - how do they come into contact with it if adults are basically immune? Does it just, like, exist in the air forever? How has it not been eradicated by herd immunity at this point? Would love an explanation for this. [link] [comments]  |
| How did the Suez Canal and the Panama Canal affect the local ecosystem in their area? Posted: 04 Aug 2021 07:46 AM PDT |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 04 Aug 2021 07:00 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| How does Yersina Pestis cause three separate, all fatal diseases? Posted: 03 Aug 2021 10:50 AM PDT I used to think that bubonic, pneumonic and septicemic plague are caused by three different pathogens. Today I found out they're all caused by the same bacteria - how does it infect either lungs, blood or lymph nodes, and how does one kill you from bleeding out internally, and the other by destroying you lymph nodes? Are those different molecular mechanisms or the same mechanism, manifesting in different ways? [link] [comments]  |
| When were carbon dioxide measuring devices first invented? Posted: 04 Aug 2021 06:32 AM PDT |
| How do we differenciate between dark matter and black holes? Posted: 03 Aug 2021 08:02 AM PDT you cant see them, you can only calculate their position by studying their gravital influence on other objects. how do you know if you got a black hole or dark matter? [link] [comments]  |
| Posted: 03 Aug 2021 07:50 PM PDT Is it because increasing distance diminishes the effect of action potentials, so you can't have just one myelinated sheath? Is there an optimal number of nodes/length? Is there a diminishing returns in the number of myelin sheath gaps? Wouldn't an neuron whose axon has an infinite amount of nodes behave similarly to a neuron that is not myelinated? [link] [comments]  |
| What does high level mathematical study give us? Posted: 03 Aug 2021 08:22 PM PDT May sound like a stupid question to some but I'm having trouble understanding how new advanced mathematical study is used to explain things like how AI works. Is it kinda like if simple addition didn't exists and a farmer was struggling to know how many apples he had. A mathematician would discover "hey if you add one apple and another you have two apples" which revolutionises apple stock taking? [link] [comments]  |
| Do covid-19 challenges to vaccinated subjects increase or decrease antibody titers in serum? Posted: 03 Aug 2021 09:03 AM PDT Looking for research into systemic response and to what degree do the antibody titers change in response to exposure and the time-frame after vaccination. [link] [comments]  |
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