AskScience AMA Series: We're NASA scientists studying the role of carbon in our planet's climate. Ask us anything! |
- AskScience AMA Series: We're NASA scientists studying the role of carbon in our planet's climate. Ask us anything!
- What are those "chunky" things around your lips?
- When a photon is "born", is it instantaneously going the speed of light? Or does it have to accelerate to that speed?
- If I'm floating in space and holding a flashlight, does the light coming out of the flashlight propel me away from the direction that I'm shining the it? (pic included)
- Would pulling the carbon out of the air help in the short term?
- How dark is space between solar systems? e.g. Would you be able to see objects in front of you by starlight alone?
- Why are stars different colours?
- If our sun is a 2nd or 3rd generation sun does that mean some of our planets could have been basking under a different sun and been formed billions of years before earth and the inner planets?
- Why do humans sometimes look upwards when trying to think or remember things?
- How did we get this picture of the milkyway galaxy if we are in it when the farthest man-made object is just outside our solar system?
- What is the maximum amount of hours you can spend in the same date?
- How efficient is the heart as a pumping machine?
- Is there an "inverse" of a black hole?
- Is there any such thing as good virus?
- Why haven't targeted cancer therapies radically improved cancer treatment?
- Given their long lifespans, do turtles or bowhead whales get dementia?
- Where does the ray of a gamma-ray burst come from?
- Does the hard cider we made have more or less calories than the non-alcoholic cider it was made from?
- [Computing] why are traces left behind after I delete a file on my computer?
- If a person speaks sign language as their main language, do they subvocalize with their hand muscles?
- What phsyical neural differences cause one to suffer from anxiety?
- How much variation is there in the sun's position in the sky on the same day of the year, from one year to the next?
- In a gaseous system at equilibrium, is the time to re-reach equilibrium after adding more gasses the same, regardless of the concentrations of gasses?
| Posted: 12 Nov 2015 04:29 AM PST Hi everyone! I am Natassa Romanou, an oceanographer at NASA's Goddard Institute for Space Studies in New York. I work with climate models and observations and I am specifically interested in how oceans change under climate change and conversely, how oceans affect the global carbon cycle and therefore the rate at which Earth's climate is changing. I am also involved in the planning of a very exciting NASA field campaign, EXPORTS, that will investigate the changes in ecosystems and carbon stocks and fluxes in the Atlantic and the Pacific Oceans. Hello all – I am Jeff Masek, a research scientist at NASA Goddard Space Flight Center in Greenbelt Maryland. My scientific focus has been on understanding forest dynamics & their role in the terrestrial carbon cycle using long time series of satellite data. I also serve as the NASA Project Scientist for the Landsat program, which provides much of our global information on land use and land cover changes. Hi everybody on line. I'm David Schimel, a carbon scientist at NASA's Jet Propulsion Lab. I look at how climate affects forest growth and loss using satellite and aircraft measurements an also measurements of carbon dioxide in the atmosphere. I work on NASA's new Orbiting Carbon Observatory-2 mission that is giving us an entirely new way of understanding ecosystems and the carbon cycle. Right now the land and ocean (over time) absorb about half of all CO2 emissions. But it's not yet clear if that will keep up! The upcoming UN climate talks in Paris will focus on levels of human-caused emissions. We are focused on the natural response to rising emissions and how we can learn more about it. We'll be online from 3-4 pm EST today to answer questions about what NASA is doing to better understand how land and ocean ecosystems are responding to a warming planet and rising carbon dioxide levels in the atmosphere — and what these ecosystem changes could mean for future climate change. Ask Us Anything! [link] [151 comments]  |
| What are those "chunky" things around your lips? Posted: 11 Nov 2015 03:51 PM PST If you kinda bite down below bottom your lip you'll feel a buncha little tapioca-like things. What are they? [link] [180 comments]  |
| Posted: 11 Nov 2015 10:46 AM PST |
| Posted: 11 Nov 2015 05:20 PM PST MSPaint representation of what I'm trying to ask. Do the photons coming from the flashlight actually exert force on me? I guess that's my real question. [link] [39 comments]  |
| Would pulling the carbon out of the air help in the short term? Posted: 12 Nov 2015 04:44 AM PST I have seen some projects recently that go well beyond trying to stop new carbon from entering the atmosphere and actually filter existing carbon out of the atmosphere. Supposing we pulled all of the excess carbon from the air in the next year, would that stop the processes of climate change, or are they already too far underway for this to help in the short term (next couple of decades) [link] [8 comments]  |
| Posted: 11 Nov 2015 04:04 PM PST |
| Why are stars different colours? Posted: 12 Nov 2015 01:31 AM PST |
| Posted: 11 Nov 2015 07:57 PM PST just wondering eris, pluto maybe even jupiter are far enough out to survive a supernova yes? what's to say they were not formed in the first incarnation of the sol system [link] [2 comments]  |
| Why do humans sometimes look upwards when trying to think or remember things? Posted: 11 Nov 2015 03:29 PM PST |
| Posted: 11 Nov 2015 10:53 PM PST As far as I'm aware the farthest man-made object in space, Voyager 1, is just outside our solar system. How did we manage to get this picture? http://wallpaper.pickywallpapers.com/2560x1440/the-milky-way.jpg [link] [4 comments]  |
| What is the maximum amount of hours you can spend in the same date? Posted: 11 Nov 2015 02:28 PM PST If you could travel fast enough. What is the maximum amount of hours one could spend on a specific date? Say i went 24 hours in one time zone, then had the speed to go to the edge of the next on and repeat as many times as possible to stay in today. [link] [22 comments]  |
| How efficient is the heart as a pumping machine? Posted: 11 Nov 2015 01:26 PM PST If you compare the heart to a motorised water pump how does it compare in terms of volume of liquid pumped compared to it's size and also in terms of energy consumption? [link] [2 comments]  |
| Is there an "inverse" of a black hole? Posted: 11 Nov 2015 01:24 PM PST If a normal black hole has a gravitational pull so strong nothing can escape, could there be an inverse construct that has a repulsive force so strong nothing could approach? [link] [8 comments]  |
| Is there any such thing as good virus? Posted: 11 Nov 2015 04:10 PM PST I know we can genetically modify bacteria to become useful and I'm wondering if there's any chance of doing the same thing a virus. If there is, what are the hypothetical applications it can have? And no, i'm not talking about vaccines here. [link] [10 comments]  |
| Why haven't targeted cancer therapies radically improved cancer treatment? Posted: 11 Nov 2015 02:52 PM PST I did an undergrad in biomedicine and engineering and one of the topics which came up a lot was how nanotech/genetics was helping create much more directed cancer therapeutics, with the aim to minimise unintended damage to healthy tissue. I've also seen numerous papers which highlight how this group's and that group's specific new method for targeting cells is shown to be highly effective. My question is.. after all this research how come we aren't hearing about dramatic improvements in prognoses in the general public? I sympathise that every cancer is different and the molecular markers which need to be targeted will differ from cancer to cancer. However, if we have the tools and the know-how, and it has been proven to work, then adapting it to at least the most common forms of tumour shouldn't be too difficult. I may well be wrong, but it appears from the outside that chemo and radiotherapy are still the staple courses of action for most inoperable cancers. [link] [6 comments]  |
| Given their long lifespans, do turtles or bowhead whales get dementia? Posted: 10 Nov 2015 06:46 AM PST |
| Where does the ray of a gamma-ray burst come from? Posted: 11 Nov 2015 12:47 PM PST I understand that a GRB is created as rotating matter falls into a newly forming black hole, but why would this process create a beam along the axis of rotation? [link] [4 comments]  |
| Posted: 11 Nov 2015 05:11 PM PST We added yeast to non-alcoholic apple cider to make hard cider, and are now debating if this has more/less/the same calories as before. I say more because alcohol metabolizes into sugar which adds more calories, and he says less because the yeast would have to use some energy to metabolize the sugar. [link] [4 comments]  |
| [Computing] why are traces left behind after I delete a file on my computer? Posted: 11 Nov 2015 09:05 AM PST I've read that files are never really deleted from computers, and that with the right software almost anything can be recovered. I have a very basic understanding of how file deletion work (afaik it just writes special data over the file, that somehow makes it much smaller) but that doesn't explain why this happens. Is it the same for a platter hdd as it is for a ssd? Is it something happening on the physical level that makes it impossible? Or is it purely software related? [link] [44 comments]  |
| Posted: 11 Nov 2015 12:03 PM PST |
| What phsyical neural differences cause one to suffer from anxiety? Posted: 11 Nov 2015 11:32 AM PST Are there any physical differences in the brain structure? [link] [4 comments]  |
| Posted: 11 Nov 2015 07:24 AM PST Given things like Stonehenge and this monument, I am wondering how much variation there is in the sun's position in the sky over the years, assuming we're plotting it at the same time on the same day of the year. I'd expect our orbit to wobble enough over time to make these things get out of alignment. [link] [3 comments]  |
| Posted: 11 Nov 2015 12:35 PM PST An example reaction: aA + bB <- -> cC + dD I was taught that, from the initial state of the system ( assuming it isn't at equilibrium), the system will eventually reach equilibrium after t seconds. After shifting the balance by any amount, such as adding 1 or 2 or 10 moles of gas A, it will take the same t seconds for the system to reach equilibrium again. I was taught that temperature and catalysts can affect t, but the concentrations of gasses cannot. This intuitively doesn't make sense to me. Assuming a starting amount of 10 moles each gasses A and B, and 0 moles C and D, it will take t1 seconds to reach equilibrium. At some point, after an amount of time t2 < t1 , the system will have not yet reached equilibrium, and will do so in ( t1 - t2 ) seconds. If, after reaching equilibrium, we alter the concentrations (by adding and removing gasses) to make them identical to the system after t2 seconds, my teacher claims it will take t1 seconds to reach a new equilibrium, but it seems like it should be ( t1 - t2 ) after this change. I can't find any material on this anywhere on the internet, and my teacher stated they cannot explain this, but it is a fact. [link] [3 comments]  |
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