If implemented fully how bad would SpaceX’s Starlink constellation with 42000+ satellites be in terms of space junk and affecting astronomical observations? |
- If implemented fully how bad would SpaceX’s Starlink constellation with 42000+ satellites be in terms of space junk and affecting astronomical observations?
- Why didn’t the Big Bang produce heavy elements?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- Do we know if our solar system is from a first or second generation star that previously exploded? Also, where did the hydrogen come from that formed our solar nebula?
- How can Google search thousands upon thousands of pages almost instantly, when it can take me a while to get a single one to load?
- Why does a damp cloth pick up more dust than a dry one?
- Where do the upper layers of dirt come from?
- How much do the tectonic plates weight?
- Are There Certain Types of Stars that have more Asteroids in their Solar Systems than others?
- Doesn't chemotherapy/radiation make it easier for cancer to grow as well?
- Any ideas how to make calcium oxide from green mussel shells?(long post ahead)
- Is the measurement of calories on the side of products, in this case a bag of chips, accurate every time?
- Does eating more fat (esp monounsaturated fat) prior to cold exposure help increase synthesis of brown adipose tissue?
- What are the factors that influence handedness in crabs?
- How does ice build up in Antarctica?
- Is there a limit to how big a star can be within the universe?
| Posted: 18 Dec 2019 12:53 AM PST |
| Why didn’t the Big Bang produce heavy elements? Posted: 17 Dec 2019 02:32 PM PST So I'm a big fan of the history of the universe. I've watched as many videos on YouTube I can find from PBS Space Time to Crash Course. One thing that always pops up though is that in the beginning the universe only created hydrogen atoms. Then as the first stars formed all the heavier elements fused and were created. But if the Big Bang was a singularity why did it not release atomic configurations for any of the heavy elements right off the bat. By definition a singularity that contains all the matter of the universe will be denser than any stars and thus fusion of all kind should have happened. So why did this process only happen after stars formed? [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 18 Dec 2019 07:08 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science 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]  |
| Posted: 18 Dec 2019 12:05 AM PST The Earth was formed around 4.543 billion years ago along with the other planets from an existing solar nebula. Where did the material come from? Was it from the death of a first or second generation star? Do we know anything about the type of star that provided the building blocks for our solar system? Also, where did all the hydrogen come from? Wouldn't the prior stars have exhausted the supply of hydrogen leaving only heavier elements? Finally, if the oldest rocks on Earth are 3.8 billion years old, how do we know the Earth is over half a billion years older than that? [link] [comments]  |
| Posted: 18 Dec 2019 04:45 AM PST |
| Why does a damp cloth pick up more dust than a dry one? Posted: 17 Dec 2019 04:02 PM PST Is it surface tension? Or is the water acting as a solvent? Or does the water loosen the fibers or otherwise change the mechanical properties of the cloth at a microscopic level? Or... I'm stumped, here! It dawned on me today as I was wiping up some dust, that I don't actually know the physical reason behind this. [link] [comments]  |
| Where do the upper layers of dirt come from? Posted: 17 Dec 2019 02:28 PM PST In archeology, generally the deeper something is found in the ground, the older it is. This indicates that as time progresses, soil is deposited ontop of the ground, burying bones, artifacts, etc. Where does this new dirt come from? Does the ground level rise as this deposition process continues? [link] [comments]  |
| How much do the tectonic plates weight? Posted: 17 Dec 2019 01:30 PM PST |
| Are There Certain Types of Stars that have more Asteroids in their Solar Systems than others? Posted: 17 Dec 2019 02:46 PM PST So, what I want to know is this: Are there, among the different types of star-types (Gs, Ms ((like red dwarfs)), Fs, Ks, etc.), certain kinds of stars that can hold a more abundant asteroid-belt, like our Sun, or have more asteroids in them than others? [link] [comments]  |
| Doesn't chemotherapy/radiation make it easier for cancer to grow as well? Posted: 17 Dec 2019 07:34 AM PST Ok, so first of all this is just a random question I asked myself a while ago. I'm not medically trained or whatever so my reasoning might be very much off. As far as I know treatment for cancer focusses on destroying the cells that went rogue, but I always wondered if this doesn't also make it easier for them to grow. I mean, not only the "bad cells" get destroyed but some good ones will go with them, correct? Doesn't this make the other cells around the tumors more vulnerable to also start doing weird things making them higher risk of also mutating to cancercells? Or do they just get destroyed en replaced by healthy ones? It might be a stupid question but I still want an answer haha. Obviously looking at the amount of times this treatment is used it's probably not the case, but how does that work then? [link] [comments]  |
| Any ideas how to make calcium oxide from green mussel shells?(long post ahead) Posted: 17 Dec 2019 03:39 PM PST Not sure if this is possible but do y'all know how to extract or make calcium oxide from green mussel shells? We need it for our research but we've tried different methods and none have worked so far. So we first tried putting the shells over an open flame from a gas stove. We placed them on top of a grill so we wouldn't have to hold them. What we got was a burnt shell that was very brittle and didn't look like calcium oxide. We also tried using a blowtorch on the shells for like, a direct contact with the flames or smth. The same thing happened, burnt mussel shells that are brittle. We planned to use calcium oxide as a water filter but every attempt we've tried so far has failed. Still can't think of an answer as to why it happened and how we can avoid it. We've looked at past research papers for tips and they always included "The dried waste shells were calcined at 700–1,000°C in air atmosphere with a heating rate of 10°C/min for 4 h " and we can't understand what it means. We tried placing them outside so they get caught in the sun's heat but nothing has happened. Maybe you guys know what calcined in air atmosphere means? We really hit a dead end here and we can't come up with an idea to go past it. [link] [comments]  |
| Posted: 17 Dec 2019 06:04 PM PST Because the calories is determined by combusting the product in a calorimeter, how can we be sure that a product that has obviously not been combusted has the same amount of calories? [link] [comments]  |
| Posted: 17 Dec 2019 06:00 PM PST |
| What are the factors that influence handedness in crabs? Posted: 17 Dec 2019 11:10 AM PST |
| How does ice build up in Antarctica? Posted: 16 Dec 2019 09:03 PM PST Where does Antarctica, which receives so little precipitation that it's technically declared a desert, get all of its ice, in some places several miles thick, if not for a constant accumulation of snow? What is the mechanism of that accumulation? [link] [comments]  |
| Is there a limit to how big a star can be within the universe? Posted: 16 Dec 2019 04:35 PM PST |
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