Is the expansion of the universe accelerating? |
- Is the expansion of the universe accelerating?
- Is there only one series of events the universe can follow?
- Where are Alpha, Beta, and Gamma Rays in the electromagnetic spectrum?
- Can the existence of randomness be proven?
- Have we created the "hottest event" we "know of" in the universe (using LHC particle collisions) since the Big Bang?
- Andromeda is approaching the Milky Way instead of moving away like every other galaxy. Was that a big problem in the process of connecting redshift with distance of galaxies?
- Electrons have a lower and lower chance of being in a location the farther they are from the nucleus. However, this chance is never zero. Could the sum of the negative charges of all electrons vastly distant from their parent atoms exert any kind of significant force on the universe as a whole?
- Do silver polishes remove the silver oxide or completely or just remove the oxygen?
- If an object were to have high enough gravity, could it cause effected objects in excess of the speed of light toward it?
- What occurs in the brain during an out of body experience?
- What organism on earth has the shortest lifespan?
- Light is affected by gravity because it has energy. Since blue light has more energy than red light, does that mean blue light is more affected by gravity than red light?
- why does some bread go super hard when it get's stale, but other go really rubbery?
- Is there any material harder then diamond?
- Can emotions be measured scientifically?
- Why do Australians have the highest per capita CO2 emissions?
- Why do domesticated canids have a huge size diversity and domesticated felids have a much smaller size diversity when the wild members of those groups show an inverse propensity?
- How does a plane provide lift?
- How large does Jupiter look from Saturn?
- Could stress really cause hair loss?
- Why don't babies and puppies learn how to walk similarly?
- It seems that DNA mutation creating a start codon would cause your body to produce a bunch of a random protein. Could this have detrimental effects on an animal's health?
- What is the equivalent of upthrust on a solid surface?
| Is the expansion of the universe accelerating? Posted: 13 Dec 2015 03:47 AM PST I've heard it said before that it is accelerating... but I've recently started rewatching How The Universe Works, and in the first episode about the Big Bang (season 1), Lawrence Kraus mentioned something that confused me a bit. He was talking about Edwin Hubble and how he discovered that the Universe is expanding, and he said something along the lines of "Objects that were twice as far away (from us), were moving twice as fast (away from us) and objects that were three times as far away were moving three times as fast".... doesn't that conflict with the idea that the expansion is accelerating???? I mean, the further away an object is, the further back in time it is compared to us, correct? So if the further away an object is, is related to how fast it appears to be moving away from us, doesn't that mean the expansion is actually slowing down, since the further back in time we look the faster it seems to be expanding? Thanks in advance. [link] [24 comments]  |
| Is there only one series of events the universe can follow? Posted: 12 Dec 2015 12:30 PM PST This concept is sort of hard for me to explain, so sorry in advance for any stupidity or confusion. Let's start with an example: If two identical particles collide something will happen (obviously), but what if we could recreate that collision in every way. Speed, distance, orientation, etc. would all be the same. I'm also not taking into account any other forces. I'm assuming this collision occurs in a vacuum with no gravitational force from any other objects beside the two particles. If all the variables are exactly the same it stands to reason that the end result of the collision would be the same. Now let's apply this on a larger scale. Lets say two cars crashed together, and again something happens. Now if we recreate the crash again with every single atom and particle in the same position and orientation, presumably the same result would occur. Now let's apply this to the entire universe. Science tells us that there was a beginning to the universe. Right before the big bang all matter in the universe was very hot and tightly packed. Every atom and particle had a position, orientation, and speed. All forces in the universe acted according to the laws of physics. So is the resulting universe, and everything in it, just an inevitable result that was guaranteed to happen due to the starting conditions of all the matter and energy in the universe? Sorry if this is a poor explanation. Please feel free to ask for clarification. Much thanks. [link] [41 comments]  |
| Where are Alpha, Beta, and Gamma Rays in the electromagnetic spectrum? Posted: 12 Dec 2015 06:02 PM PST I can't find an answer without a staggering amount of jargon, so I'll ask this here, to you physicists. Are these rays a type of radiation, like a subgroup of X rays or something? How do they work? [link] [12 comments]  |
| Can the existence of randomness be proven? Posted: 12 Dec 2015 07:37 PM PST My brother and I were arguing about if the simple act of going back in time would result in a different future regardless of how much impact you had on time. In the end the argument came down to my belief that some things are truly completely random and thus would alter the past timeline without interference by yourself while he believed that true randomness does not exist and thus if you did nothing to alter the past it would repeat in the exact same way. As such I would like to know if we know of something that is truly random or have evidence that true randomness exist in some way. I don't know if mathematics is the best flair for this but I can't think of anything better. [link] [18 comments]  |
| Posted: 12 Dec 2015 07:40 PM PST There's been some recent discussion and articles like this one that have been interpreted to suggest we have created a condition in the LHC that has not occurred since the Big Bang. This BBC infographic http://i.imgur.com/OBtEMzG.jpg (source) has no condition or event between the LHC "temperature" and the energy levels just after the Big Bang. Also see this and this. Are we comparing apples and oranges when we compare temperatures of a nanosecond high-energy collision experiment to observed energies from natural events like supernova? Isn't it probable that these extremely high "temperatures" (or particle collision energies if I understand correctly) ARE found within well known, high energy phenomena? Or in other words, wouldn't it be probable that in a naturally occurring, high energy phenomenon, some high energy particles would collide in a way that the particle collision "temperature" somewhere would be very high, exceeding those produced here on earth by man? As an analogy, if we could detect a cup of liquid water (for example, 24C = 75F) on another planet, we would still know without a doubt that some of the particles have "above boiling" energy even though we don't measure it directly. It would be absurd to suggest that, because we cannot directly measure such water vapor particles elsewhere, the "only known" high energy water vapor particles coming off 24C liquid water has been created here on Earth. Or have we truly created a condition here on Earth that has most likely never occurred since the Big Bang? [link] [5 comments]  |
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| Do silver polishes remove the silver oxide or completely or just remove the oxygen? Posted: 12 Dec 2015 04:39 PM PST Same with copper polishes, etc. Are they removing the oxygen from the surface or the whole outer layer? Would leaving the silver in the polish eventually dissolve the silver? [link] [6 comments]  |
| Posted: 12 Dec 2015 07:06 PM PST I was messing around in universe sandbox and I thought it would be a hilarious riot if I were to give the sun the 1.5 times the mass of the milky way. It instantly turned into a black hole and everything in the solar system started accelerating towards it at speeds exceeding the speed of light. If an object were to have high enough gravity, could it cause effected objects in excess of the speed of light toward it? [link] [5 comments]  |
| What occurs in the brain during an out of body experience? Posted: 12 Dec 2015 07:10 PM PST |
| What organism on earth has the shortest lifespan? Posted: 12 Dec 2015 10:59 AM PST |
| Posted: 13 Dec 2015 05:27 AM PST If so, does that mean light can create a diffraction-like pattern if affected by strong enough gravity? [link] [4 comments]  |
| why does some bread go super hard when it get's stale, but other go really rubbery? Posted: 12 Dec 2015 02:18 PM PST I'm french so I eat baguette, so I don't know if it's different with other kinds of bread, but I have noticed that some brands go rock hard after a few days while other become really rubbery. [link] [2 comments]  |
| Is there any material harder then diamond? Posted: 12 Dec 2015 06:47 PM PST I've heard that carbon nano-tubes are supposed to be harder, or mure durable then diamond. (since diamond is hard but brittle) Is this true, and what makes it harder than diamond? Is there any other material that is harder than diamond, or does diamond has the perfect atomic structure for "hardness"? [link] [4 comments]  |
| Can emotions be measured scientifically? Posted: 12 Dec 2015 09:16 AM PST Using the neural activity? or Just like doctors ask patients to describe the pain on a scale? What emotions can be measured, if any? I know they are subjective, but is it easy to rate them on a scale, without much thinking? What does the research on human psychology of moods and emotions show in the regard of measuring one's emotions? What are the most primary emotions everyone experience on a daily basis? I have so many questions that need some scientific answers related to emotions and moods, I'll add as edit if this question gains some traction. EDIT: This is much different to my question. What are the most popular/less controversial techniques and ways used to measure? [link] [6 comments]  |
| Why do Australians have the highest per capita CO2 emissions? Posted: 12 Dec 2015 02:42 PM PST per capita CO2 emissions by country, Austalia at the top, with the United States in close second One would think it would be about their heavy per capita consumption of coal, but Greece, North Korea and South Africa all have higher per cap consumption rates than the United States. So what are the driving factors here that Australian carbon emissions are so high? [link] [6 comments]  |
| Posted: 12 Dec 2015 04:07 PM PST Nondomestic canids range in size from the fennec fox at 1.3 pounds to the gray wolf at 174 pounds. Domestic canids, however, seem to have an enormous size range, from the world's smallest at 4 ounces to the world's largest at 343 pounds. The inverse seems to be true with wild vs. domestic felids: nondomestic felids range in size from the 3 pound black-footed cat to the 660 pound tiger, while domesticated cats have a comparatively tiny size range, with the world's smallest at around 3 pounds and the world's largest at 47 pounds. Why is there such a huge size range in our domesticated dogs when such a smaller size range exists in their wild relatives? And why do we not have a larger size range in our domesticated cats when their relatives show a huge diversity of size? Does this have to do with human intervention and breeding, and using dogs for work? Does it have to do with the relative docility and ease of management of a domestic dog vs. the semi-wildness that still exists in a "domestic" cat? And how on earth did we breed domestic dogs so much bigger than their wild counterparts, while keeping cats small (and manageable). I'd love to hear some ideas (and see some science, if there is any) on why our pets turned out so differently. Thanks! [link] [3 comments]  |
| How does a plane provide lift? Posted: 12 Dec 2015 02:12 PM PST A couple of days ago i stumbled upon this comment from a youtube video, which i unfortunately forgot the title of. I sent this comment to one of my high-school friends who was writing about it, so that's why i have the comment. Does anyone know the answer? i always thought it was the Bournelli effect. "The way a wing provides lift is commonly thought to be due to the Bournelli effect. The idea is that because the wing is curved on top and flat on the bottom, air that goes over the top has to go faster to meet up with the air that goes along the bottom in order to meet up again at the trailing edge. Faster air is lower in pressure so the higher pressure under the wing lifts the wing. That's wrong, even though it's still in many text books. The air that goes over the top doesn't have an appointment with the air that goes along the bottom. It doesn't have to get to the trailing edge at the same time as the air it left to go under the wing. If that was true then an airplane couldn't fly upside down but they can (if they're strong enough to handle the stresses). The truth is that at a molecular level the air molecules tend to stick to the wing (the Coanda Effect) so as it follows the curve of the wing it accelerates downwards and through F=MA there's a reactionary force in the up direction. So it's largely the _angle of attack" of the wing that's responsible for lift and that's why planes can fly upside down. Most people don't know that in my experience and even with a degree in physics I only found out about it a couple of years ago." [link] [5 comments]  |
| How large does Jupiter look from Saturn? Posted: 12 Dec 2015 10:38 AM PST |
| Could stress really cause hair loss? Posted: 12 Dec 2015 12:50 PM PST Are there any large studies done on the effect of stress on hair? I know it's 'common knowledge' that stress causes hair loss, but I'm skeptical. [link] [comment]  |
| Why don't babies and puppies learn how to walk similarly? Posted: 12 Dec 2015 01:15 PM PST Hello! I was wondering why do babies take some months before learning how to crawl and then how to walk (or directly how to walk if they don't crawl) while for most if not all the animals I can think of, their puppies are able to walk (usually on 4 legs) in a few hours after birth. Is this common to other primates? If not, how could such a thing not be a disadvantage in prehistory? Wasn't there any environmental pressure on them selecting only the ones able to walk in a few hours? [link] [4 comments]  |
| Posted: 12 Dec 2015 12:12 PM PST Wikipedia says that nonsense mutations are caused by a mutation creating an end codon causing a protein to end prematurely. (https://en.wikipedia.org/wiki/Nonsense_mutation) but it says nothing about start codon mutation. It also says that in order to start DNA transcription nearby DNA sequences are required in addition to the start codon so this type of mutation would be more common than a nonsense mutation. (https://en.wikipedia.org/wiki/Genetic_code#Start.2Fstop_codons) I'm curious as to whether this type of mutation exists because it doesn't have a wiki page. [link] [3 comments]  |
| What is the equivalent of upthrust on a solid surface? Posted: 12 Dec 2015 01:30 PM PST I'm not quite sure how to properly articulate this, but, as far as I understand, the reason we do not fall through the floor is as of an equal and opposing force to the gravity pulling down on us. I'm guessing this force is some sort of electromagnetic resistance, in that the atoms of the floor are repelling the atoms in feet, but this is what I am trying to ask, and if there is a proper name for it. Thanks! [link] [1 comment]  |
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