We know we'll see a supernova in 2016 because we've already seen it happen due to gravitational lensing. How is this possible? |
- We know we'll see a supernova in 2016 because we've already seen it happen due to gravitational lensing. How is this possible?
- AskScience AMA Series: We are Brian Schmidt and Paul Francis, Cosmology researchers and professors at Australian National University. AUA!
- How close can two things get without touching?
- How does a fish's stomach/digestion work?
- Smiling helps produce hormones such as serotonin and dopamine, but does aggressive and masculine behaviour increase testosterone production?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- Are there any equations we can use to demonstrate or visualise general relativity?
- Why can almost any function be easily differentiated while so many functions cannot be integrated or are much more difficult to do so?
- Why does blood rush to our head when we're hanging upside down, but doesn't rush to our feet when we're standing right-side up?
- If the universe moves towards entropy then how did planets and life get created?
- Are there Coriolis-like effects due to the Earth revolving around the Sun?
- Why do heroin addicts feel pain when they no longer take heroin?
- Why do can't people with 20/20 vision refocus their eyes when wearing glasses?
- Are mental illnesses caused by brain chemical/activity imbalances or vice versa?
- [Physics] When boiling water on stove, why does water make a noise that gradually increase until right before boiling point?
- Was Dark Energy present at the Big Bang?
- Is there a term for when your brain perceives motion of objects surrounding you as your own motion?
- Why does adding a little salt to a bitter drink make it more tolerable?
- What's the smallest an exotic star/pulsar could be?
- Where does the proton's mass come from?
- Theory of Relativity States Time is Physical?
| Posted: 24 Nov 2015 07:50 AM PST |
| Posted: 24 Nov 2015 08:57 AM PST Hello, AskScience! We're delighted to be here. We're professors at the Australian National University, currently co-teaching an online course on Cosmology. About Paul: I divide my time between astrophysics research and teaching. My research interests include comets, giant space blobs and hidden quasars. My teaching style (and taste in waistcoats) has been called unorthodox, and I've won awards for both teaching and science communication (no awards for the waistcoats, however). I am currently trying to work out why the tails of distant comets don't point the direction they should. About Brian: I am a Laureate Fellow and Distinguished Professor at ANU, and led the team that discovered dark energy – work which won the 2011 Nobel Prize for Physics. I am continuing my work using exploding stars to study the Universe, and am leading ANU's effort to build the SkyMapper telescope, a new facility that will provide a comprehensive digital map of the southern sky from ultraviolet through near infrared wavelengths. I, too, have never won an award for a waistcoat. Check out our free Cosmology course on edX, and Ask Us Anything! (We'll be back at 4 pm ET (1 pm PT, 9 pm UTC) to answer your questions!) (Edit: formatting/a link) Edit: Hi Guys - Got to finish up now - Tweet me more questions to @cosmicpinot! Hope to see you in class. [link] [175 comments]  |
| How close can two things get without touching? Posted: 25 Nov 2015 04:54 AM PST |
| How does a fish's stomach/digestion work? Posted: 24 Nov 2015 05:23 AM PST Predatory fishes swallowing whole another fish is a typical picture seen in documentaries. But, how does a fish's digestion work when compared against land animals? Are their preys whole and alive in their stomach until they suffocate from the lack of water/oxygen flow? And what about the gastric acids? How does living in an underwater environment affect the digestive juices composition/concentration? [link] [18 comments]  |
| Posted: 24 Nov 2015 09:34 AM PST |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 25 Nov 2015 07:02 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [2 comments]  |
| Are there any equations we can use to demonstrate or visualise general relativity? Posted: 24 Nov 2015 08:45 PM PST We often see diagrams showing the Earth or sun in a kind of grid that is bent that shows light following a geodesic ( rubber sheet model or so-called embedding diagram . I've asked in /r/askphysics but they claim there are no simple equations that demonstrate this principle and they also suggest that these kinds of diagrams are poor or misleading. How can we visualise these effects? even for just a slice of space-time for example. Why can't we plot for example the curvature of space-time caused by the sun in 2 dimensions? The closest I have found is at http://www.spacetimetravel.org/isl/isl.html but what equations are they using for example to show this? [link] [9 comments]  |
| Posted: 24 Nov 2015 04:28 AM PST |
| Posted: 24 Nov 2015 06:08 PM PST |
| If the universe moves towards entropy then how did planets and life get created? Posted: 24 Nov 2015 07:59 PM PST I was discussing god and atheism and all that with my theist cousin. He said that the universe moves towards entropy, towards disorder then how did something as complex as a human being get created? It must be a sign pointing towards god. So what do I say to him in return? [link] [9 comments]  |
| Are there Coriolis-like effects due to the Earth revolving around the Sun? Posted: 24 Nov 2015 07:16 PM PST The Coriolis effect results in deflections of inertial systems on the surface of the Earth and also influences vertical motion. Are there any similar measurable effects due to orbiting the Sun at ~18 miles per second? [link] [6 comments]  |
| Why do heroin addicts feel pain when they no longer take heroin? Posted: 24 Nov 2015 06:18 AM PST I know how the nervous system works and that when people take heroin it blocks the receptors. This then leads to the body growing more receptors. Then it repeats until there are millions of receptors. Ultimately my question is: What triggers the receptors to feel pain when people are recovering from heroin addiction? [link] [42 comments]  |
| Why do can't people with 20/20 vision refocus their eyes when wearing glasses? Posted: 25 Nov 2015 06:34 AM PST Why can't the lens/cornea adjust to refocus the image onto the retina? [link] [2 comments]  |
| Are mental illnesses caused by brain chemical/activity imbalances or vice versa? Posted: 24 Nov 2015 02:38 PM PST I don't technically mean to limit this to only illnesses, but perhaps it'll make the question easier to answer. The mechanism for action for many drugs for anxiety, depression, etc. seem to be based upon fixing a chemical imbalance and brain activity imbalances in the brain. However, it seems some non-drug based methods for mental illnesses (eg. CBT, four steps method for OCD from Dr. Schwartz, and meditation) also produce observable changes in brain activity (and presumably chemical composition) in patients. Is there a general consensus and a lot of strong evidence for which is the cause and effect in the brain for illnesses? [link] [4 comments]  |
| Posted: 24 Nov 2015 02:03 PM PST I recently realized that water makes this "pkhhh" noise getting lauder until it boils. And when it starts to boil it stops. But why? [link] [5 comments]  |
| Was Dark Energy present at the Big Bang? Posted: 24 Nov 2015 07:17 PM PST What I mean is, when did Dark Energy begin to start pushing matter and dark matter apart? [link] [1 comment]  |
| Is there a term for when your brain perceives motion of objects surrounding you as your own motion? Posted: 24 Nov 2015 09:31 AM PST For example, when you are sitting in a car, see somebody pulling forward, and perceive it as your car going in reverse? [link] [4 comments]  |
| Why does adding a little salt to a bitter drink make it more tolerable? Posted: 24 Nov 2015 11:52 AM PST Even a very small pinch of table salt makes coffee and green tea much more easily tolerated. Is this an effect on the tastebuds or is it something happening on a chemical level? I can find a lot of resources online mentioning the effects but none of them address what's happening at a molecular level. [link] [4 comments]  |
| What's the smallest an exotic star/pulsar could be? Posted: 24 Nov 2015 05:35 PM PST There's plenty out there for black holes being a very wide variety of sizes, from the sub-nano to approaching the parsec. The range is narrower for Neutron stars, between ~50ish and ~20ish kilometers for their modest mass range (anywhere from 0.1 solar masses to ~2ish?). What I'd like to know is: what sort of sizes can other exotic formations be? (Quark stars, strange stars, etc.) Secondly, what's the smallest a black hole can be before it immediately evaporates due to hawking radiation? [link] [3 comments]  |
| Where does the proton's mass come from? Posted: 24 Nov 2015 03:56 PM PST I know the proton's mass does not come from the individual quark's rest mass. Where does the rest of the mass come from? I found two different answers in two different sources:
Which is the right answer? Do they both refer to the same thing? [link] [17 comments]  |
| Theory of Relativity States Time is Physical? Posted: 24 Nov 2015 07:39 PM PST The theory of relativity tells us that time can bend around physical objects. How is this possible if time is merely a concept or unit of measure developed by people? A second should still be a second regardless of distance or speed traveled? Just as that distance would be measurable to the foot, meter, km, au, ect. Distances do not change as they are also a predetermined length. So how is it that a concept developed by the human race is suddenly changed purely based on speed? [link] [2 comments]  |
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