How do spacecraft like Cassini avoid being ripped to shreds by space dust? |
- How do spacecraft like Cassini avoid being ripped to shreds by space dust?
- Why does Mars have a slightly larger axial tilt than Earth without similar evidence of a proto-planet impact?
- How did we discover the shape of our galaxy?
- What stops micro chips in humans from being rejected by the body similar to splinters or other foreign bodies?
- What is the evidence supporting the effect of "leadership" or "team-building" courses in business?
- Could an creature have both an endo and exoskeleton? Do any?
- Why aren't we using gravitational potential batteries instead of electro-chemical ones for large scale power storage?
- In hormonal birth control, why don't the placebo pills cause a woman's natural cycle to start?
- Why do Lithium Ion batteries, like in a smartphone, lose their capacity over time? Can it be remedied?
- How accurate are DNA tests in determining ancestry?
- Why two electrons with same spin cannot co-exist but protons can?
- This graph appears to show a decline in measles cases prior to the introduction of the measles vaccine. Why is that?
- What is the likelihood of the LIGO Gravity Wave Detection Results being errant?
- What liquid is the wettest?
- What was the first empirical evidence of the existence of black holes?
- Why does hyperkalamia depolarize a cardiac muscle cell?
- Why are the different gas giants different colors?
- Is there a giant rocky planet ?
- What is dust and where does it come from?
- Are humans born with all the veins and arteries they'll ever have or do more grow as the older?
- Why don't positrons appear in the standard model but electrons do?
- When did the habit of writing st, nd, rd and th in superscript after numerals become a thing in English, and is writing "10th", for example, actually correct (especially in typed documents or on the Internet), or should it also be superscripted, strictly speaking?
- Why does all visible light travel at the same speed through a vacuum, but not through a medium?
| How do spacecraft like Cassini avoid being ripped to shreds by space dust? Posted: 13 Sep 2017 04:06 PM PDT |
| Posted: 13 Sep 2017 05:49 PM PDT I learnt that Earth has its axial tilt because of an impact with a proto-planet that also created the moon. While Mars also has two moons, they are 106 and 107 times smaller than our own moon. Why doesn't Mars posses a similarly proportional sized moon? [link] [comments]  |
| How did we discover the shape of our galaxy? Posted: 13 Sep 2017 03:08 PM PDT Since nothing man made (that I know of) has left the galaxy how did we figure out it was spiral and not something else? [link] [comments]  |
| Posted: 13 Sep 2017 08:23 AM PDT Title basically explains it all. Recently had stitches that were in for too long which caused the skin too swell and become irritated and was thinking what sort of effects it has on microchips or any other sort of technology that involves planting something under the skin(not organs or living material). [link] [comments]  |
| What is the evidence supporting the effect of "leadership" or "team-building" courses in business? Posted: 13 Sep 2017 04:56 PM PDT I know that these courses are often ridiculed in popular culture but they seem to be fairly widespread. Is there any good evidence supporting their use? Do we know how long the effects last? [link] [comments]  |
| Could an creature have both an endo and exoskeleton? Do any? Posted: 13 Sep 2017 03:22 PM PDT |
| Posted: 14 Sep 2017 12:58 AM PDT I have heard of an idea that we could dig holes and put weights on vertically moving platforms. When there is excess power generation motors lift the weights. When the power is needed we simply let the weights descend turning electric generators. It seems to me that this way of power storage can be build on a huge scale and would be much simpler to make than enormous batteries. With power storage for cities solar panels and wind turbines can store power for cloudy windless days. Why aren't we using this technology? Is it even possible? [link] [comments]  |
| In hormonal birth control, why don't the placebo pills cause a woman's natural cycle to start? Posted: 13 Sep 2017 10:16 AM PDT I understand that hormonal birth control pills work by preventing your body from producing it's own hormones (and therefor preventing the 28 day female menstrual cycle from beginning). However, when you take hormonal birth control pills the last week or so is always placebo pills. Why doesn't this withdrawal from hormone ingestion start the 28 day menstrual cycle and cause the hypothalamus and pituitary gland to begin secreting the necessary hormones? Additionally, how come if you miss one active pill it is said that your body can start it's natural cycle but taking 7 consecutive placebo pills does not? [link] [comments]  |
| Posted: 13 Sep 2017 10:14 PM PDT For instance, my ~3 year old phone has a noticeable drop in capacity over the years. What causes this? Is there any way to slow its "degradation" down, to make it last even longer? [link] [comments]  |
| How accurate are DNA tests in determining ancestry? Posted: 13 Sep 2017 03:13 PM PDT Particularly things like 23andMe and ancestry.com. Can they really determine your ancestors' ethnicities, or is it all a scam? [link] [comments]  |
| Why two electrons with same spin cannot co-exist but protons can? Posted: 14 Sep 2017 04:17 AM PDT I dont have proper knowledge about particle physics and Quantum mechanics but from what i know I would like to ask that if 2 electrons of same spin cannot exist in the same orbital (pauli exclusion) then how can several protons exist in the nucleus together (and neutrons too)? Please do provide some links from where I can get more knowledge of this field. Im 16 btw. [link] [comments]  |
| Posted: 14 Sep 2017 08:36 AM PDT |
| What is the likelihood of the LIGO Gravity Wave Detection Results being errant? Posted: 13 Sep 2017 11:03 PM PDT I have been lightly paying attention to the LIGO events the last couple of years and I understood that their original detection and publication and subsequent detections to have all been published and vetted with a high degree of significance. However when I brought up the LIGO detection tonight at a local astronomy club meeting as observational evidence of BH merger, the physics teacher in the club adamantly denied the papers/detectors validity, saying that the amount of error in the study was too high and the initial paper had been widely discredited. I'd never heard of that, and I thought the studies were still being celebrated for their success. Is there a problem with the detection or their publications? [link] [comments]  |
| Posted: 13 Sep 2017 10:15 PM PDT I'm sure wettest is the wrong word. I'm trying to ask what liquid would soak through the most layers of say paper towels or whatever. Like per tablespoon which liquid soaks the most. [link] [comments]  |
| What was the first empirical evidence of the existence of black holes? Posted: 13 Sep 2017 10:05 PM PDT |
| Why does hyperkalamia depolarize a cardiac muscle cell? Posted: 13 Sep 2017 09:05 PM PDT I learned recently that hyperkalamia inhibits cardiac muscle function because the excess K+ ions outside the cell keep the K+ ions inside the cell from diffusing out during the repolarization phase. What I can't figure out is this: given that the membrane potential is the difference between the charge outside and inside the cell membrane, and that in hyperkalamia, there is an unusually high concentration of K+ ions outside the cell AND inside the cell, why doesn't the membrane potential stay about the same (allowing the cell to keep working normally)? Thanks! [link] [comments]  |
| Why are the different gas giants different colors? Posted: 13 Sep 2017 06:26 PM PDT Presumably the material they were made of was all the same gas cloud. Why do the different planets then have such dramatically different colors? [link] [comments]  |
| Is there a giant rocky planet ? Posted: 13 Sep 2017 06:11 PM PDT Why almost every giant planet ( Jovian ones ) are gas planet ? Is there a possibility of a rocky giant planet with the size of Jupiter ? [link] [comments]  |
| What is dust and where does it come from? Posted: 13 Sep 2017 05:31 PM PDT |
| Are humans born with all the veins and arteries they'll ever have or do more grow as the older? Posted: 13 Sep 2017 02:56 PM PDT If they gain more how does this growth process take place with disrupting blood flow? [link] [comments]  |
| Why don't positrons appear in the standard model but electrons do? Posted: 13 Sep 2017 07:39 PM PDT Positrons are just electrons with the same mass but positive charge right? So why are they not as "fundamental" as electrons? I understand that other anti-matter particles are just different combinations of particles on the standard model, but how can that be the case for positrons? [link] [comments]  |
| Posted: 13 Sep 2017 08:43 PM PDT |
| Why does all visible light travel at the same speed through a vacuum, but not through a medium? Posted: 13 Sep 2017 05:49 PM PDT Additionally, does this apply for all other types of radiation in the electromagnetic spectrum? E.g. radio waves travel slower through a medium than UV waves? [link] [comments]  |
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