AskScience AMA Series: I am Greg Matloff, and I work on the science of interstellar travel. Ask Me Anything! |
- AskScience AMA Series: I am Greg Matloff, and I work on the science of interstellar travel. Ask Me Anything!
- How do incubating eggs survive without an oxygen supply inside the egg?
- [Mathematics] What number refers to the number of possible orderings of natural numbers?
- Like carnivores, do herbivores kill the young of other herbivores to eliminate competition for resources?
- What's happening in your body when you 'sober up' due to panic?
- If I have two cups, A and B, with the same volume and temperature, 80 Celcius and you add the same volume of cold liquid 4 celcius. Will the temperature of cup A and B be different if i add cold liquid drop by drop to cup A and all the liquid at the same time in cup B after the same time?
- What factors determine the optimal body temperature of an endothermic species?
- If two object with different thermal energy values were sitting in a pure vacuum without physical contact would they still eventually exchange heat? If so, how?
- When the Chicago River's flow was reversed in 1900, what was the public health impact to the American South along the Mississippi River?
- How can you tell the difference between a dicot stem and a monocot root?
- Is there a substance that's inherently salty but does not contain NaCl?
- How was the rotational speed of the Fizeau–Foucault apparatus measured accurately enough to calculate the speed of light with only a 5% error in the 1840s?
- Is there any test that can without a shadow of a doubt give exact age of a human?
- Can spontaneous fission be considered a decay mode? Why do elements tend toward an equal balance of protons and neutrons?
- How could Neutrinos be Majorana Particles if we have different way to detect neutrinos and anti neutrinos?
- Was there an alternate theory for the extinction of dinosaurs prior to the Alvarez Hypothesis?
- Can a planet have a heavy metal core (as opposed the nickel-iron core we have)?
- Could Venus have supported life in its past?
- What is the actual formular for the sin/cos/tan fuction?
| Posted: 31 Mar 2017 05:01 AM PDT Greg Matloff, Ph.D., is a recognized expert on interstellar travel. He lives with his wife, artist C Bangs, in Brooklyn, New York. Greg teaches physics and astronomy at the City University of New York, has consulted for NASA, is the author or co-author of 12 books and more that 130 scientific papers and serves as an advisor to Yuri Milner's Project Breakthrough Starshot. Although he has contributed to studies of extra-solar planet detection, Earth atmosphere chemistry, Earth defense from asteroid impacts and the search for extraterrestrial intelligence, his main research interest is the solar photon sail. Greg feels that the human future and that of our planet's biosphere will be shaped by our ability to utilize solar system resources for terrestrial benefit. He has recently contributed to the scientific investigation of the possibility that the universe is conscious. See google scholar for his publications, or at www.gregmatloff.com and www.conscious-stars.com. Our guest will be joining us starting at 12 PM ET (16 UT). Ask him anything! [link] [comments]  |
| How do incubating eggs survive without an oxygen supply inside the egg? Posted: 30 Mar 2017 08:28 PM PDT Saw the gif of a baby snek emerging from an egg and taking a big first breath, and I wondered how it was breathing before it emerged? [link] [comments]  |
| [Mathematics] What number refers to the number of possible orderings of natural numbers? Posted: 30 Mar 2017 09:21 PM PDT The number of unique orderings of a set of length n is n! and as such it seems logical to me that the number of unique orderings of the natural numbers is Aleph null factorial, but what does it mean to take the factorial of an infinitely large number as infinity minus one is still infinity(i think). I was also thinking about the Continuum hypothesis which says that the cardinality of the set of real numbers is 2 raised to the Aleph null. x! grows faster than 2x so would that make the number of unique orderings of the natural numbers to be larger than the set of real numbers(assuming that we are able to take the factorial of Aleph null)? Apologies if my question makes assumptions which are incorrect, but thanks for reading! [link] [comments]  |
| Posted: 30 Mar 2017 05:17 PM PDT |
| What's happening in your body when you 'sober up' due to panic? Posted: 30 Mar 2017 08:31 PM PDT |
| Posted: 31 Mar 2017 01:41 AM PDT |
| What factors determine the optimal body temperature of an endothermic species? Posted: 30 Mar 2017 07:53 PM PDT Reading that the "low" body temperature (94 - 97 F) of opossums made them less vulnerable to rabies got me thinking about the "normal" body temperatures of other mammals. After some Googling I could find little obvious pattern in the optimal temperature of different species, other than monotremes having lower temperatures than marsupials, which in turn have lower temperatures than placentals. But what other factors go into determining the "healthy" temperature of an endothermic species? [link] [comments]  |
| Posted: 30 Mar 2017 10:54 PM PDT To my understanding all thermal exchange needs an interaction of molecules to take place, higher energy values 'gravitate' then mix in with lower energy states. If there is no 'physical' or atomic interaction to take place, would the atom excitation release from both objects and then eventually interact with each other until equilibrium was reached? [link] [comments]  |
| Posted: 30 Mar 2017 05:14 PM PDT The flow was reversed because people in Chicago were getting sick due to the presence of human waste and other contaminants in the river. Reversing the flow reduced the spread of disease because it no longer gathered in Lake Michigan. However, that stuff didn't disappear. How did the reversal impact public health along the Mississippi River, the new destination for Chicago's waste and sewage? [link] [comments]  |
| How can you tell the difference between a dicot stem and a monocot root? Posted: 30 Mar 2017 08:58 PM PDT Searching this question on Google only brings up comparisons between the different roots and stems. Pictures of the ones I looked at: http://imgur.com/a/cEbWo [link] [comments]  |
| Is there a substance that's inherently salty but does not contain NaCl? Posted: 30 Mar 2017 08:18 PM PDT |
| Posted: 30 Mar 2017 03:56 PM PDT I love the story of this discovery and the problem--solving aspect of it, but it seems like every description I've seen omits how in the world Fizeau was able to determine the speed of the spinning toothed wheel close enough to be remotely useful without any sort of digital timing device. Am I the only one missing this piece of the puzzle? Did he just estimate over and over and take an average that happened to be in the ballpark? BONUS: What other interesting devices or methods of precision were used in the pre-digital or pre-mechanical days? Any still regularly used that one wouldn't necessarily expect? [link] [comments]  |
| Is there any test that can without a shadow of a doubt give exact age of a human? Posted: 30 Mar 2017 03:44 PM PDT |
| Posted: 30 Mar 2017 01:40 PM PDT Optionally, do neutron-poor elements make good materials for neutron absorption? [link] [comments]  |
| Posted: 30 Mar 2017 12:04 PM PDT |
| Was there an alternate theory for the extinction of dinosaurs prior to the Alvarez Hypothesis? Posted: 30 Mar 2017 05:20 PM PDT |
| Can a planet have a heavy metal core (as opposed the nickel-iron core we have)? Posted: 30 Mar 2017 10:18 AM PDT |
| Could Venus have supported life in its past? Posted: 30 Mar 2017 10:25 AM PDT Do we have evidence that Venus has always been the hellscape it is now or could it have had a milder climate in the past? [link] [comments]  |
| What is the actual formular for the sin/cos/tan fuction? Posted: 30 Mar 2017 08:40 AM PDT I have searched for it but all I can find are equations like sin(alpha) = a / c But what I am interested in is the following: What is the formular that your calculator uses when you type sin(45°) for example? [link] [comments]  |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
