Is long exposure necessary in taking pictures of "deep space" and if so, how come? |
- Is long exposure necessary in taking pictures of "deep space" and if so, how come?
- Why is it that when you feel mildly sick from dehydration, within merely the time it takes to drink water, you almost instantly feel better? Is it a psychosomatic case, or is the body that effective at taking in water?
- Why do you need to refrigerate some sealed foods after opening? Doesn’t the temperature matter even when it’s sealed?
- Are submarines vulnerable to storms on the sea?
- Is your brain able to make sense of the situation if one gets shot in the head? Is there any time between impact and death?
- Why does an ideal fuel:air mixture not burn completely, in practice? Why do the "lean" mixtures used in road vehicles not burn completely, either? Is there leftover oxygen, as well? If so, why is secondary air injection needed? Thanks.
- How were photographs sent back to earth from early satellites?
- How, and where do you find promethium?
- Why aren't white objects mirrors?
- Could somebody please better explain the difference between the speed of electricity through a conductor and an electron’s drift velocity?
- Does the Arthur–Merlin protocol in Complexity Theory have any connection with probabilistic "proofs" such as the Miller-Rabin Primality Test?
- Do you need a nervous system to get tired (i.e. experience tiredness)?
- Why do manual transmission cars typically have 5-6 instead of 7-8?
- How does testosterone make people become sexually attracted to others?
- How does the size of an atom change as you move through the periodic table?
- Is there any way to describe the right-handedness of a coordinate system without resorting to hands?
- How does the umbilical cord form?
- Why do we not know the exact 3-dimensional structure of the scrapie form of prion protein yet we know the proportion of alpha and beta sheets within its structure?
- How do people create "x-ray videos"?
- Is pH What Determines What Is an Antioxidant/Oxidant?
| Is long exposure necessary in taking pictures of "deep space" and if so, how come? Posted: 29 May 2018 06:44 PM PDT If I had a quality telescope, and just zoomed into the general direction of the centre of the Milky Way, say, and took a quick photo, would I be able to see the centre in good quality? Edit: hoh, this blew up. Thanks for the responses! Now I know how it's done haha [link] [comments]  |
| Posted: 30 May 2018 05:01 AM PDT |
| Posted: 29 May 2018 05:26 PM PDT |
| Are submarines vulnerable to storms on the sea? Posted: 30 May 2018 03:25 AM PDT |
| Posted: 29 May 2018 01:22 PM PDT Title. Might be a bit too macabre to post here. I don't know. I'm wondering if a brain has time to process anything if it gets completely destroyed, like in an explosion or something. [link] [comments]  |
| Posted: 29 May 2018 08:37 AM PDT |
| How were photographs sent back to earth from early satellites? Posted: 29 May 2018 09:21 PM PDT Digital cameras as we know them didn't exist in the late 1940s and 1950s, but I can't imagine that film was just ejected out of a satellite on a one way trip out of orbit and was expected to make it back to earth, much less survive reentry. [link] [comments]  |
| How, and where do you find promethium? Posted: 30 May 2018 02:13 AM PDT |
| Why aren't white objects mirrors? Posted: 30 May 2018 12:33 AM PDT If white objects reflect all light, then why don't they act like mirrors? Only think I can think of is maybe that white objects are "messy" in the way they reflect light? Like the reflections go in different directions but I don't know if that's right or if there's maybe a better explanation. And similarly, why are mirrors silver in color but reflect seemingly all light? [link] [comments]  |
| Posted: 29 May 2018 10:11 PM PDT How is it that an electron's energy can travel at nearly the speed of light but it physically take an electron an hour to make it across a meter long conductor? This confuses me. [link] [comments]  |
| Posted: 30 May 2018 05:31 AM PDT Scott Aaronson refers to the MA complexity class as being about probabilistic proofs. Does this mean things such as probabilistic proofs of primality, such as Miller-Rabin, or is it referring to something completely different? [link] [comments]  |
| Do you need a nervous system to get tired (i.e. experience tiredness)? Posted: 30 May 2018 03:54 AM PDT Can plants get tired? My rock looks tired. Is my rock tired though? What about my walls - are they tired? [link] [comments]  |
| Why do manual transmission cars typically have 5-6 instead of 7-8? Posted: 29 May 2018 01:11 PM PDT Wouldn't it be more efficient, especially at high speed, to have a larger gear ratio? With that said, isn't it common for automatic transmission cars to be "7-8 speed"? [link] [comments]  |
| How does testosterone make people become sexually attracted to others? Posted: 29 May 2018 11:04 PM PDT I remember the day I started liking the opposite sex, but I don't understand how testosterone goes from my gonads to my brain to doing something in my brain that makes me start noticing figures and long legs. What does testosterone do once it reaches my brain that makes me like the opposite sex? [link] [comments]  |
| How does the size of an atom change as you move through the periodic table? Posted: 29 May 2018 08:06 PM PDT I know that the mass of an atom is due primarily to the nucleus and the make up of its nucleus determines the atomic number. Since mass and density goes up as we go along the periodic table, I would assume that the overall volume of the atom itself must not increase in a linear way. i.e. an atom with 10 times the mass of hydrogen is not 10 times the volume. My question is this, if a hydrogen atom were the size of a baseball, how big would some of the other atoms be? (C, Au, U, etc.) [link] [comments]  |
| Is there any way to describe the right-handedness of a coordinate system without resorting to hands? Posted: 29 May 2018 11:43 AM PDT |
| How does the umbilical cord form? Posted: 29 May 2018 10:23 PM PDT |
| Posted: 29 May 2018 09:27 PM PDT |
| How do people create "x-ray videos"? Posted: 29 May 2018 09:14 PM PDT I am wondering how people get x-ray images that are videos. From how I understand normal x-rays work, it seems that a video would be impossible, and with my understanding of radiation exposure, probably be giving them cancer anyway. How would you take a video and not give the person involved cancer? example of what I am talking about here. [link] [comments]  |
| Is pH What Determines What Is an Antioxidant/Oxidant? Posted: 29 May 2018 01:18 PM PDT Processed cocoa is cocoa that has been alkalized. It is said that it doesn't have as much antioxidative capability. Are all these "antioxidants in health"-publications just exploring the pH of the body? In other words, whats the difference between pH and a measure like ORAC? [link] [comments]  |
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