| How do meteorologists calculate wind chill or “feels like” temperatures? Posted: 14 Nov 2019 03:07 PM PST |
| Did Huygens potentially contaminate Titan? Posted: 15 Nov 2019 06:51 AM PST As I understand it Cassini was deliberately directed into the atmosphere of Saturn to avoid an accidental crash landing on one of the system's moons and a potential contamination of the environment with earthly bacteria. How come there was no such concerns about landing Huygens on Titan? Was this as reckless as it seems considering the views of, among others, Chris McKay ( I know he was involved in the hydrogen tests during the decent) regarding the possibility of life on Titan? How did the scientific community justify the risks? submitted by /u/demojunky73 [link] [comments] |
| If contact between matter and its antimatter counterpart causes annihilation that is extremely energetic, how is antimatter creation at the LHC safe? Posted: 14 Nov 2019 11:08 PM PST |
| If insects can grow larger by being raised in an oxygen-rich environment, can animals like crabs and lobsters also grow larger in oxygen-richer water? Posted: 15 Nov 2019 05:24 AM PST There have been experiments showing that insects grow a bit larger when raised in a high-oxygen container. Does that carry over to sea arthropods too? What would the other limitting factors be? How could an experiment be designed and performed in order to test this hypothesis? submitted by /u/rosenbergstein [link] [comments] |
| Is it possible for a modern ship to go Canada-West Russia (Moscow) through the Artic? Posted: 15 Nov 2019 04:52 AM PST |
| Weird permanent thing in the sky? Posted: 14 Nov 2019 07:58 PM PST A few months ago, my dad and I were camping in the middle of nowhere in Queensland, Australia. There was no major light pollution for at least 60 kilometres, so we could see a lot of the stars and astronomical stuff. Around 9 pm, we were sitting there looking at it all, and I noticed a cloud; nothing strange, so I took no notice of it. It was a moderately windy night, so when I looked back at it 20 minutes later and it hasn't moved, I was naturally curious. I asked him if it was one of those huge masses of gas in space, and he said it probably wasn't, and he wasn't exactly sure what it was. He did a lot of science and mathematics in university, so I trusted him. I am also relatively knowledgeable in physics (brag), but I couldn't think of what it could be. I forgot about it, and then we went to bed (tent?) at 11 pm-ish. At 3 am, I got up to go pee, and it was in the exact same spot as when I saw it hours ago, even though the rest of the starts and gas masses had shifted around. At that point I realised that it had to be in our atmosphere, or spinning with the earth at least, because it hadn't moved. It also definitely couldn't have been a cloud or anything physically light because at that time it was insanely windy at sea level, so I couldn't imagine what it would be like that far up. Still now, months later, I have no idea what it could have been. Does anyone in the entire r/science community have an idea? It's been killing me ever since I saw it. submitted by /u/decmh_ [link] [comments] |
| What evolved first, Limbs or Digits? Posted: 15 Nov 2019 02:29 AM PST Did we have at some point in our evolution history we're we creatures with limbs which then started to split into digits or did we have clusters of digits that started to extend away from the body on limbs? Or did both limbs and digits evolve pretty much simultaneously? submitted by /u/Dave-the-Flamingo [link] [comments] |
| How does the Aristotle's lantern (the jaw apparatus found in a sea urchin) work? Posted: 15 Nov 2019 07:17 AM PST Hello! I'm a non-scientist (obviously!) who is currently working on a design project. While doing my research, I came across the structure of the mouth of the sea urchin (known as Aristotle's lantern) and I'm really fascinated. I tried to read more about it on the internet, but due to my non-science background, I have trouble understanding it. Can somebody please explain to me how does the mouth of a sea urchin work? How is it formed structurally? What is the mechanism behind the movement? How is it held together? Thank you very much :)) submitted by /u/babybananacake [link] [comments] |
| How did the spread of the Black Plague die down? Posted: 14 Nov 2019 01:48 PM PST |
| Are there any problems that classical computers are better at solving than quantum computers? Posted: 14 Nov 2019 05:03 PM PST |
| If I have two stop watches and start a timer, leave one on earth, take the other one to mars and come back. Will they show the same time time counted? Posted: 15 Nov 2019 01:58 AM PST I've been trying to wrap my head around the concept of how time is slower/faster on other planets. So if I have two stop watches and start them at the same time, then take one to Mars, stay there for a couple of days, then fly back. Will they still show the same time? Or will the one that I took to mars have counted faster? Because apparently time is faster on mars (I think). I just clearly understood how speed is relative and I want to understand this as well. submitted by /u/Bderken [link] [comments] |
| How does the quantum tunneling effect limit development of micro processors and how do we overcome that? Posted: 15 Nov 2019 04:57 AM PST |
| Is it true that people are physiologically inclined to feel more awake at certain times? Posted: 15 Nov 2019 04:37 AM PST In other words, is the idea of a "morning person" and "night person" actually valid? I'm wondering if this is true because I've always felt extremely tired sleeping early and waking up at 6AM every day for work, but I felt perfectly fine whenever I slept late and woke up at 12PM during my university days. Is it because I'm actually, on a physiological level, a night person? Or am I just mentally convincing myself that I am and that I could just simply adjust to this early-morning lifestyle if I'd just accept it gung-ho? submitted by /u/john_wildemire [link] [comments] |
| Rocketship going 51%c shoots out a second rocket ship going 51%c? Posted: 14 Nov 2019 01:31 PM PST I sometimes help tutor remedial introductory uni-physics, and someone asked this question and it honestly stumped me I couldn't figure out an intuitive way to answer this basic question. The student asked something like: "If you had a rocket ship that was travelling through space at 51% of the speed of light relative to earth and it had a smaller rocket ship on board and it shot off the second spaceship from its docking bay and the smaller rocket ship also accelerated itself to 51% the speed of light relative to the first ship. Wouldn't the smaller rocket ship be travelling at 102% the speed of light relative to earth?" I started talking about frames of reference but honestly, I can't for the life of me figure out an intuitive way of explaining that. Pleas help. submitted by /u/coolyouone [link] [comments] |
| How is melanin produced in humans/how does tyrosinase produce melanin? Posted: 15 Nov 2019 02:56 AM PST |
| How does CERN/LHC deal with soil movement? Posted: 14 Nov 2019 02:44 PM PST I was watching a video on the LHC and this question popped into my mind that I couldn't find an answer to online. Which is how the LHC in Geneva accounts for soil movement, expanding soils, and things like that, given that it's such a massive structure? Wouldn't it eventually throw their measurements off? I know they need a remarkable amount of precision to electromagnetically shoot particle beams into one another. submitted by /u/Domorama [link] [comments] |
| Why is it often the case that invasive species outcompete native ones when native species have evolved specifically to be best suited to their environment? Posted: 14 Nov 2019 01:13 PM PST |
| What keeps the galaxies intact? Posted: 14 Nov 2019 02:58 PM PST Trying to explain myself better, according to scientists, the matter that we can see, is not enough to hold the galaxies together, so there must be a matter that we don't see, that only interacts gravitationally with the "normal" matter. But as far as we know, do we have evidence that it is the dark matter that keeps the galaxies intact? Or could it be magic or the power of God or stuff like that, holding the galaxies together? Sorry if my question seems stupid to you, and for my mistakes in writing English. submitted by /u/TristoMietiTrebbia [link] [comments] |
| Is the Earth completely neutral or is more acidic or basic? Why? Posted: 14 Nov 2019 01:12 PM PST At least in soils, it seems that the majority of Earth's soils are acidic. This makes me wonder if the Earth is majority acidic. submitted by /u/Crawfish1997 [link] [comments] |
| Is there any actual difference in battery technology or is it all marketing like "quantum" batteries from Duracell? Posted: 14 Nov 2019 11:16 AM PST |
| How do bugs survive winter by hiding in tiny cracks, when big animals like us are so vulnerable to it? Posted: 14 Nov 2019 10:17 AM PST |
| When light enters a black hole and then fails to exit it, would the black hole not cause the light to slow down below the speed of light which, should be impossible for light in a vacuum? Posted: 14 Nov 2019 10:38 AM PST |
| Has there been any progress of pinning down the free parameters of generalizations of general relativity like Brans-Dicke or Kaluza-Klein so that we can actually calculate with them? Posted: 14 Nov 2019 02:05 PM PST I heard somewhere that at low energies superstring theory reduces to a version of Brans-Dicke, which is basically general relativity with an extra scalar field instead of the gravitational constant G. If this is true, then if we can determine a decent value of ω, won't that help narrow down the string theory landscape? I'm curious about this kind of approach because it sounds like we might not get any experimental evidence for string theory at the quantum scale any time soon, but perhaps there's a way at much larger scales? submitted by /u/schottm [link] [comments] |
