AskScience AMA Series: I'm Dr. Allison Kirkpatrick, an expert on supermassive black holes, and discoverer of the newly defined Cold Quasars. Ask Me Anything! |
- AskScience AMA Series: I'm Dr. Allison Kirkpatrick, an expert on supermassive black holes, and discoverer of the newly defined Cold Quasars. Ask Me Anything!
- Greenland ice melt reporting has me worried, what are ramifications of this year's melt?
- Do lasers have recoil?
- Why DT-Fusion instead of DD-Fusion?
- How does the Circadian Rhythm changes for people on International Space Station who face 45 minutes of day (sunlight) and night?
- What is it about cockroaches that makes them famously able to survive radiation from a nuclear apocalypse?
- Do each of my chromosomes come from a specific grandparent or are they all a mix of genes from each?
- How do astronomical observatories make self-positioning?
- What is the energy need to take 1 kg of mass to the sun?
- Does our own galaxy gravitationally lens/distort starlight from outside the Milky Way as perceived from here on earth?
- In the Boeing 737 Max the engines were moved forward and upward on the airplane. Why does this cause an upward pitch tendency under high thrust such that the MCAS system is required? It seems like it should cause the opposite.
- Using molecular vibration to degrade molecules?
- Do fish drink water?
- Has the ozone layer recovered from where it once was?
- How do you design primers?
- How common are Naegleria fowleri (brain amoeba) in hot springs waters?
- How does fire act in very high pressures?
- What is it that makes materials elastic?
- Who does the sun heat the earth if it's only 10,000 degrees Fahrenheit and it's 93,000,000 miles away?
- How do ocean waves work?
- What exactly are scientists observing when conducting deep inelastic scattering, and how do they use this to understand the structure of sub-atomic particles?
- Why was "Munchausen syndrome" changed to "Factitious disorder"?
| Posted: 18 Jun 2019 04:00 AM PDT I'm an assistant professor of astrophysics at the University of Kansas. I search for supermassive black holes, particularly in the distant universe (lookback times of 7-12 billion years ago), in order to figure out what effect these hidden monsters are having on their host galaxies. Most of my work has been centered around developing techniques to find supermassive black holes that aren't very active-their host galaxies are still in the prime of star formation. Recently, I stumbled across the opposite scenario. I found a population of the most active supermassive black holes out there. These black holes are so active that we normally would not expect their host galaxies to be intact and forming lots of stars... and yet, they are! I coined this population "cold quasars" due to the amount of cold gas and dust they have. Read more here: https://www.washingtonpost.com/science/2019/06/13/this-is-what-it-looks-like-when-galaxies-are-about-die/?utm_term=.e46559caeaf7 Press release: https://news.ku.edu/2019/06/05/astrophysicist-announces-her-discovery-new-class-cold-quasars-could-rewrite I'll be on at 1pm CDT (2 PM ET, 18 UT), ask me anything! [link] [comments]  |
| Greenland ice melt reporting has me worried, what are ramifications of this year's melt? Posted: 17 Jun 2019 08:31 AM PDT |
| Posted: 18 Jun 2019 02:38 AM PDT Newton's third law tells us that every action has an equal and opposite reaction, and you'd then think a laser shooting out photons of one end, would get pushed back, like a gun shooting a bullet (just much much weaker recoil). But I don't know if this is the case, since AFAIK, when energy is converted into a photon, the photon instantly acheives the speed of light, without pushing back on the electron that emitted it. [link] [comments]  |
| Why DT-Fusion instead of DD-Fusion? Posted: 18 Jun 2019 03:41 AM PDT Why is DT-Fusion the desired goal of fusion research when DD-Fusion has a higher energy output (or am I wrong here)? What are the benefits of DT-Fusion over DD-Fusion? Would be great if you guys could link sources as well! [link] [comments]  |
| Posted: 18 Jun 2019 12:20 AM PDT |
| Posted: 18 Jun 2019 01:44 AM PDT Are they really the only (land?) animals that would be able to make it? Is this specific resilience an evolutionary advantage or just some kind of quirk of their biology? Thanks [link] [comments]  |
| Do each of my chromosomes come from a specific grandparent or are they all a mix of genes from each? Posted: 18 Jun 2019 02:46 AM PDT I know I have 23 chromosome pairs, 23 from my mother and 23 from my father. But is my 1st chromosome a match to one of my grandparents 1st chromosome or does it have a mix of genes from all of them? If it's matching chromosomes, does that mean I get ~12 Maternal Grandmother Chromosomes ~11 Maternal Grandfather Chromosome from my Mother and similarly from my Father? And then on back through them ~5-6 from each of my great-grandparents, ~2-3 from each great-great, ~1-2 from great-great-great, ~0-1 from my great-great-great-great, etc. So does that mean if I pick an ancestor 6 generations back, I probably don't share any chromosomes with them? Does that mean I wouldn't be any more genetically related to most of my 128 great-great-great-great-great-grandparents than I am to anyone else from that generation, since I only have 46 chromosomes only 46 of them could have contributed a chromosome to me? [link] [comments]  |
| How do astronomical observatories make self-positioning? Posted: 18 Jun 2019 02:02 AM PDT If they have static "earth" coordinates, do they consider tectonic plates movement? [link] [comments]  |
| What is the energy need to take 1 kg of mass to the sun? Posted: 18 Jun 2019 12:57 AM PDT Was wondering what is the energy need to take 1 kg of mass to the sun? Also how much difference does it make with gravity assist or similar methods? What's the ratio of energy needed to escape earth gravity to the energy needed to reach the sun? Thanks in advance... [link] [comments]  |
| Posted: 17 Jun 2019 10:05 PM PDT |
| Posted: 17 Jun 2019 09:19 PM PDT If the heavy engines are moved forward that seems like it would produce a nose-down tendency, and if they are moved upward closer to the vertical center of mass, it seems like the plane would have a reduced tendency to pitch up because the thrust would be coming from closer to that vertical center of mass instead of slung well below the aircraft on a long moment arm. So why did this change in the 737 produce an upward pitching tendency during low speed high thrust phases of flight? It seems like the opposite should be the case. Is it the nacelle shape causing excess lift forward of the CG? Why isn't this a problem at higher speeds? Is it a problem that only manifests at high AoA? [link] [comments]  |
| Using molecular vibration to degrade molecules? Posted: 18 Jun 2019 12:22 AM PDT Hi Reddit, I was wondering if it is possible to use the molecular vibration of a molecule to help i'ts degradation. Let's say i have a salt, and i know the exact IR band at which light is absorbed at the ionic bond. Could i make an IR lamp with a bandpass filter and excite the molecules enough to cause increased dissociation? Does it make sense that if the molecule is in an exicted state, especially at the ion bond, it would dissociate faster or easier? Or would any dissociation just be becuase of the increase in energy of the molecule due to the temperature increase of absorbing tha IR radiation? Thanks. [link] [comments]  |
| Posted: 17 Jun 2019 08:57 PM PDT |
| Has the ozone layer recovered from where it once was? Posted: 18 Jun 2019 02:45 AM PDT |
| Posted: 18 Jun 2019 02:43 AM PDT If primers are meant to direct the amplification of nucleotide sequences, how would one go about designing primers for a gene sequence? Would a gene sequence be something like 'ATG..... stop codon'? Primers work on DNA so essentially what gets amplified includes the introns? How would one go about finding the sequence for the gene of interest? Do we design primers that anneal to the ends of the gene of interest? Or before a few bases before the gene? Been reading about this and am genuinely confused by how this actually works. If this works, wouldn't most scientist be able to amplify certain genes like (poisons/fluorescence/regeneration) and then carry out potential transfaction? [link] [comments]  |
| How common are Naegleria fowleri (brain amoeba) in hot springs waters? Posted: 18 Jun 2019 12:49 AM PDT I'm wondering how prominent brain amoeba is in hot springs waters. My wife and I are at a hot springs resort in California (Benton) and shes very concerned about it after getting water in her nose accidentally. They said they clean the tubs every day and by the looks of it they do. It is a very clean place but I was under the impression they are in the water regardless of if the tubs were cleaned or not. Thank you! [link] [comments]  |
| How does fire act in very high pressures? Posted: 17 Jun 2019 03:41 AM PDT For example fire in a room with 100 times athmospheric pressure. [link] [comments]  |
| What is it that makes materials elastic? Posted: 17 Jun 2019 11:09 PM PDT |
| Posted: 17 Jun 2019 08:16 AM PDT Not a flat earther, I'm just genuinely curious as to how this is possible. I've gotten an answer that it's because the sun is very big, and if that is the answer, can you explain? And I meant "How" in the title. [link] [comments]  |
| Posted: 17 Jun 2019 12:16 PM PDT I understand that it's just an effect of the wind. But why are they periodic? Is the wind itself blowing with periodicity? And how exactly does the wind cause such large crests in places like the North Shore or Gold Coast? [link] [comments]  |
| Posted: 17 Jun 2019 09:00 PM PDT So I'm familiar with Rutherford's experiment and how DIS is an extension of it, and the fact that we can't have free/bare quarks. But I'm curious about how the experiment actually works, and if we could ever detect sea quarks with it (As opposed to just valence quarks) [link] [comments]  |
| Why was "Munchausen syndrome" changed to "Factitious disorder"? Posted: 17 Jun 2019 07:14 AM PDT |
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