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Sunday, August 26, 2018

How much longer will the Hubble Space Telescope remain operational?

How much longer will the Hubble Space Telescope remain operational?

How much longer will the Hubble Space Telescope remain operational?

Posted: 25 Aug 2018 06:38 PM PDT

How much longer will the Hubble Space Telescope likely remain operational given it was launched in 1990 and was last serviced in 2009,9 years ago?

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submitted by /u/Laser20145
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Can someone explain the behavior of Superfluid Helium?

Posted: 25 Aug 2018 11:06 PM PDT

It has been stated that superfluid helium can flow indefinitely under its own inertia and without friction. How is this possible?

submitted by /u/Dick_Van_Dangerous
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How do we know Uranus's atmosphere is made of ammonia?

Posted: 25 Aug 2018 06:09 PM PDT

I've often read about how Uranus's atmosphere is composed primarily of ammonia. This has puzzled me, since we have never ever been to Uranus and probably never will be able to go, and it's also hard to wrap my head around the fact that the same substance used in household cleaning solutions is also the main component of the atmosphere of a remote planet in the outer reaches of our solar system. Can we tell just by looking at the color of Uranus's atmosphere? I'd imagine it's impossible to determine what a distant planet's atmosphere is made up of considering we've never actually gone there.

submitted by /u/hedabla99
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Why this exception to the Ionization energy trend?

Posted: 25 Aug 2018 09:58 PM PDT

In group 13, the order of decreasing I.E. is- B>Tl>Ga~Al>In Why is this so? According to the usual rule shouldn't it be- Tl>In>Ga>Al>B ?

submitted by /u/salvayin
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Are scientists concerned about the amount of earthquakes around the world lately? There are so many major ones happening lately is there any reason for this?

Posted: 26 Aug 2018 04:29 AM PDT

I'm not a scientist by any means but I have noticed what appears to be an increase in earthquakes everywhere around the globe. Is this an unusual occurrence? Are scientists worried?

submitted by /u/witchporn
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How does CocaCola’s color changing can work ?

Posted: 26 Aug 2018 03:42 AM PDT

Cocola has a can bottle, when it gets cold its color turning into white to bluish. How does it happen and what kind of reaction occurs? (I could not share a photo link because i am from Turkey and here imgur is banned :( )

submitted by /u/kingasso
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How is electricity conducted in bodies of water?

Posted: 25 Aug 2018 12:32 PM PDT

We are all familiar with the toaster in the bathtub suicide method, but it got me thinking about how that process works. How exactly is electrical current conducted through water, and how does that relate to the amount of charge/voltage applied to the water and volume of water being effected? What happens if a lake or ocean is struck by lightning?

submitted by /u/BarbituateEater
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Why are aurora at mid-latitudes almost exclusively red?

Posted: 25 Aug 2018 06:42 AM PDT

I understand that under normal circumstances, red aurora (in normal aurora latitudes) occur at high altitude when the solar winds hit oxygen.

What I haven't found in searching is an explanation for why, during those super-intense CME (coronal mass ejections) that allow us to see the aurora in the southern US on those rare occasions, that it's almost always red. At least, in the photos of aurora events that I have seen from that region.

Is there something about getting closer to the equator that prevents the solar wind's electrons from penetrating as deep into the atmosphere as they do in the polar latitudes? If so, what is it?

submitted by /u/forgotaltpwatwork
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Why did Olympus Mons form in the exact same way of Mauna Kea in Hawaii, but the Martian volcano is 5 times bigger?

Posted: 25 Aug 2018 11:58 AM PDT

Why and how does a banana keep turning more and more brown? (Pomology)

Posted: 25 Aug 2018 04:12 PM PDT

How are electronegativity values for elements determined?

Posted: 25 Aug 2018 07:12 PM PDT

I understand that electronegativity is the tendency for elements to attract electrons, but I was wondering how the specific values for each element is calculated?

submitted by /u/TechSupport15
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What is quantum vacuum and vacuum energy?

Posted: 25 Aug 2018 07:37 AM PDT

I remember my science teacher once said particles were contantly being created and dissapearing in the vacuum, is that related to this? If so, how does science explain this? Also, why hasn't it been exploited yet?

submitted by /u/inhuman0id
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If temperature is held constant, why does steam have less internal energy at higher pressures?

Posted: 25 Aug 2018 09:49 AM PDT

From looking at steam tables, steam has a lower internal energy at higher pressures provided that temperature is held constant. Why is that? If possible, please include a discussion of Morse potential in your answer. My theory is that an applied pressure shifts the entire Morse potential plot down, making the potential energy more negative. Since, (1) internal energy is kinetic energy + potential energy, (2) kinetic energy in the two cases is equal because temperature is equal, and (3) potential energy will be more negative in the high pressure case, the internal energy will be lower in the high pressure case.

submitted by /u/bnpm
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How much does the earth need to move to/from the sun in order for life to end?

Posted: 24 Aug 2018 07:57 PM PDT

Asked by my 8 year old daughter.

submitted by /u/lokier01
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what makes water have such a high heat capacity when compared to other, more complex materials?

Posted: 24 Aug 2018 08:47 PM PDT

Is there any other substance that comes closr?

submitted by /u/Critwhoris
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Saturday, August 25, 2018

Can cancer be transferred from host to host?

Can cancer be transferred from host to host?

Can cancer be transferred from host to host?

Posted: 24 Aug 2018 07:47 PM PDT

Okay, so say cancer cells or a tumor are removed from a human or animal, and are then surgically placed inside of another hosts body, will the cancer cells survive and continue to duplicate? Or will the process of them leaving the host be enough to kill them in the first place?

submitted by /u/alextomato
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How far back in human history would we have to go before modern humans could not reproduce with their ancestors?

Posted: 24 Aug 2018 01:11 PM PDT

i.e. how far back would we have to go to be technically considered a different species?

submitted by /u/bizzehdee
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How does Vanta Black work when it comes to absorbing light?

Posted: 25 Aug 2018 06:29 AM PDT

Specifically, what happens to the light it absorbs? Is there a limit of how much light it can absorb? Does the fact that it absorbs light mean it actually stops the photons?

submitted by /u/twelveinchmeatlong
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Is there a point/determination which a trans person is considered male or female when gender specific health/medical information is involved?

Posted: 25 Aug 2018 05:38 AM PDT

Something that I've often wondered is when a transgender person is considered their cisgender equivalent in terms of government advice on health and alcohol consumption, but also taking 'gendered' multivitamins among many other possibilities.

For example, regarding:

"Doctors suggest that women should drink less than men. This is because women's body tissue absorbs higher concentration of alcohol than men's."

When does it matter that a trans person follow the guidelines for their cisgender equivalent? Does it at all?

Hormone replacement therapy does redistribute fat and change a bunch of other things like the ability to gain and maintain muscle mass, so I'm wondering when these types of advice above becomes relevant.

If I had to make an educated guess, would it be based on the dominant sex hormone(s) over a certain period of time, or the mere fact that a sex hormone is dominant to begin with (regardless of a timescale)?

submitted by /u/firebyte
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Why do very few high order derivatives not show up very often in equations of motion?

Posted: 24 Aug 2018 02:22 PM PDT

I've seen a lot of equations of motion in terms of velocity and acceleration. But I've never seen ones where dn x/dtn for n > 2 show up or even the n-th integral of x with respect to t ever pop up. This even seems to happen in what I've read about quantum mechanics and relativity, (although I haven't read much about relativity).

Why would the laws of physics pretty much limit itself to only using distance, velocity, and acceleration when there's an infinite amount of higher order derivatives that it could use?

submitted by /u/ddotquantum
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Why there is potential energy inside the nucleus of an atom?

Posted: 25 Aug 2018 05:20 AM PDT

I dont understand why there is a lot of potential energy inside atoms and why fission and fusion release energy. I dont understand the relationship between binding energy and electrostatic force.

submitted by /u/calistosystem
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Why is it that objects are exposed to great heat and friction when entering into Earth’s atmosphere coming from space, to the ground, when those same objects that leave earth do not seem to be affected by the same forces?

Posted: 25 Aug 2018 04:45 AM PDT

When objects are coming from space back to earth's ground surface, they experience great heat, friction and other forces when entering the atmosphere. Why is it that rockets don't seem to be subjected to the same fear of burning due to friction leaving earth, as they do returning?

Obviously, rockets can explode and they can break apart due to gravitational forces and pressures, but unless I am fundamentally misunderstanding physics, they don't seem to share the same kinds of concerns leaving, as opposed to entering. What is the cause for reentry friction, as opposed to initial take off friction and heat?

submitted by /u/xXTheCitrusReaperXx
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Why do neutral atoms of almost all elements release energy when an electron is added to them,why do some elements deviate from this behaviour?

Posted: 24 Aug 2018 01:10 PM PDT

I don't quite understand why electron gain enthalpy is negative.

submitted by /u/NAYAN_SEES
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We can't specify the position of an electron around the atom, applying the same principle we also can't specify the position of the nucleus, right?

Posted: 24 Aug 2018 01:20 PM PDT

Why is it that some scents (cigarette smoke) cling to our clothes or other objects, and others do not?

Posted: 24 Aug 2018 10:57 AM PDT

Are there any physical or chemical differences between fast and slow twitch muscle fibers?

Posted: 24 Aug 2018 03:13 PM PDT

For years, I've been told all about my "fast twitch" and "slow twitch" muscle fibers when being coached for cross country, track, and tennis. However, I've never stopped to think about what makes muscle fibers one or the other.

Here are some of my main questions about it: 1) Are there any actual differences between them? 2) Are muscle fibers either fast twitch or slow twitch? If yes, can they switch from being fast twitch to slow twitch, or are they only either one? 3) Do the differences come from the way they are formed, or utilized (difference in signals coming from the brain)? If the differences come from being formed, how does your body know what type to form and where to form them?

If there are no differences, am I thinking into this too much? Is it just that there's a difference when you're doing aerobic versus anaerobic exercise? Clearly, I don't know much about this topic. Please try to help me understand :)

submitted by /u/Jaetpack
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Does Mars have enough of an atmosphere to allow sound to travel through it?

Posted: 24 Aug 2018 02:56 PM PDT

This picture of Godzilla on Mars made me wonder if Mars has enough of an atmosphere to allow sound to travel through it. Such as Godzilla's distinctive roar (assuming it could even roar with so much carbon dioxide)

If we had a microphone, or even a human standing on Mars in an EVA suit, would they be able to hear sounds from any large distance? Or would they even feel the vibrations through the soles of their shoes from a sound originating above ground level?

submitted by /u/ChuunibyouImouto
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How do our brains know to send the correct signal to move a specific part of our body (i.e a specific finger or toe)?

Posted: 24 Aug 2018 11:40 AM PDT

I've read that it is estimated that something between 60% and 90% of all species are insects. Regardless of the actual number: why are insects such a rich and diverse class of species?

Posted: 24 Aug 2018 01:58 PM PDT

Is there any practical reason as to why there are so many species that are insects compared to other classes? Or is it just that our way of classifying animals makes the insects somehow a broader class than others?

submitted by /u/whatkindofred
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Can what someone looked like in life be reconstructed with DNA alone? Can we use the DNA of people who died before photography and reconstruct their appearance? (For example, King Richard III's bones/DNA)

Posted: 24 Aug 2018 03:14 PM PDT

What kind of fish and other aquatic creatures lived along side cavemen?

Posted: 24 Aug 2018 02:48 PM PDT

Is it true that time stops at the surface of a black hole? How does that happen?

Posted: 24 Aug 2018 07:45 AM PDT

What purpose does HBr serve in medications?

Posted: 24 Aug 2018 08:08 AM PDT

I'm super interested in medications and chemistry. Obviously I know this is Hydrobromide, but what purpose does it serve? Thank you for your responses!

submitted by /u/mumblrrr
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Is a particle's probability wave a wave in the quantum field?

Posted: 24 Aug 2018 08:31 AM PDT

A particle is an excitation in some quantum field. Before measurement, when the particle is best described as a probability wave, is that waviness something happening in the field, or is the probability distribution itself a description applied separately to the field. In other words, is the probability wave a wave in the quantum field, or a statement of uncertainty about what is happening in the quantum field?

submitted by /u/harumphfrog
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Do Bosonic and Fermionic isotopes tend to have different chemical properties?

Posted: 24 Aug 2018 08:00 AM PDT
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Friday, August 24, 2018

How does water get hot enough to evaporate and form clouds? It needs to get at least 100°C and that seems tough, especially in the winter.

How does water get hot enough to evaporate and form clouds? It needs to get at least 100°C and that seems tough, especially in the winter.

How does water get hot enough to evaporate and form clouds? It needs to get at least 100°C and that seems tough, especially in the winter.

Posted: 24 Aug 2018 12:49 AM PDT

How fast are ions moving during electrolysis?

Posted: 23 Aug 2018 10:10 PM PDT

Could a room temperature plasma exist?

Posted: 24 Aug 2018 05:41 AM PDT

To be brief: Generally in nature we see matter in one of three states: solid, liquid, or gas. The state of an element or compound is generally dependent upon its chemical / atomic properties and the outside forces acting on it. Could there be an element or compound not yet discovered that exists as a plasma at close to what we would consider "room temperature"? I was thinking about high temperature superconductors and mentally started down this little rabbit hole, but don't know enough about plasmas to even make an intelligent guess.

submitted by /u/musicmunky
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How big of a role does drag play in atmospheric reentry breakup?

Posted: 24 Aug 2018 02:04 AM PDT

Are there any natural processes that involve the weak nuclear force?

Posted: 23 Aug 2018 10:36 PM PDT

Why is it that for some things (like pulling the seal off a milk bottle), you need dry fingers or rough textures, but for other things (like opening a plastic carrier bag) you need wet fingers and smooth textures?

Posted: 23 Aug 2018 01:54 PM PDT

Why do two seemingly similar surfaces need such different approaches to generate grip?

submitted by /u/claireauriga
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Is there a limit for an optical telescope and how further it can look? Is there a limit in general for how further we can look into space?

Posted: 23 Aug 2018 05:47 PM PDT

I was curious if there is any limit for an optical telescope with lenses and mirrors to look further into space. If we make big optical telescope with giant lenses will it be good and can look much further? I also read about electro-magnetic telescope, but didn't fully understand how it can pictures or simulate how far away objects look like. With the kinds of telescope there are today, how do you mkae better telescope. I mean what are the technical things to do for making a telescope or any kind of technology to look further into space, and making a picture that a normal person can see and understand how the object looks like.

submitted by /u/Yuval2B
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How are species that change sex when the male/female population is too low able to trigger the response?

Posted: 23 Aug 2018 03:31 PM PDT

It's my understanding that certain species will change sex when the opposite sex has disproportionate population numbers. How are they able to react to the lack of mates? Is it chemical signaling? If so, how is this communicated between the organisms?

submitted by /u/Para2014
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The earth is an oblate spheroid. What effect does it have on plate tectonics when plates move over regions with differing curvature?

Posted: 23 Aug 2018 10:43 AM PDT

Why is does a pot make sounds right before the water starts to boil?

Posted: 23 Aug 2018 12:59 PM PDT

Is the epicenter for fore and aftershocks generally the same as for the main earthquake? How spread out are they generally?

Posted: 23 Aug 2018 06:04 PM PDT

Also, is there a general "size" of the epicenter? Like, how detailed do we make the epicenter map? For instance, this map shows the epicenter for the 2015 Nepali Earthquakes. How zoomed in on that epicenter could I go and still have a definite line?

submitted by /u/Sophia_Forever
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Is air a homogeneous or heterogenous mixture?

Posted: 23 Aug 2018 02:20 PM PDT

Today in Chemistry class, we were going over the types of solutions/compounds and the teacher classified air (just "in general") as a homogenous mixture. However, its contents aren't defined and it's not uniform in its composition. Is it still homogenous due to its average composition, or it it heterogenous because it doesn't fit normal definitions?

submitted by /u/video-brain-games
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How are we able to distinguish between two sounds that are the same pitch but come from different instruments?

Posted: 23 Aug 2018 07:39 AM PDT

For example how come a violin playing a note with a frequency of 196Hz sounds different than a trumpet playing at 196Hz?

submitted by /u/TriathlonBoy1
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How does a single transistor malfunctioning not render an entire computer unusable?

Posted: 23 Aug 2018 03:10 AM PDT

I dont know of this is the correct sub to ask, but anyway this is my question.

If I change one + sign in my code to - the whole program gives rubbish results. Then how does a computer which depends upon thousands of transistors not turn into garbage with a single transistor going dead.

submitted by /u/IG_Monkey
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How is there ice on top of Mt. Everest if it's closer to the sun?

Posted: 23 Aug 2018 09:54 PM PDT

Ok so I've asked a couple of smart people I know this (I'm not the brightest :P) and they've made guesses like:

It's not real heat, its solar radiation that comes from the sun and they because of the laws of energy conservation, it's converted to heat when it's reflected or absorbed on the Earth's surface (like how white reflects and black absorbs), this kind of makes sense but I want to know the real answer. Thanks!!

submitted by /u/Sergeantboingo
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Am i blinding spiders?

Posted: 22 Aug 2018 10:29 PM PDT

I have one of those super bright tactical flashlights that have warnings NOT to shine them in people's eyes due to possible retina damage. I use my flashlight at night outside in my yard and like to look at all the spiders and check out how neat they are. Then it occurred to me, could I be blinding them because my light is too bright? I've noticed several of the really cool ones are gone and I'm worried it's my fault.

submitted by /u/amanda0369
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What is the physiological cause of death in excited delirium patients?

Posted: 23 Aug 2018 09:56 AM PDT

I'm struggling to understand what exactly causes the sudden respiratory and then cardiac arrest. Is it actually related to the "excited delirium" or is it due to extraneous factors, such as being accidentally smothered by the police?

submitted by /u/Lilalu182
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