Leaderboard
Popular Content
Showing content with the highest reputation on 05/25/19 in all areas
-
I dropped out of science and math in middle school but my son likes it. I once told him “all things, everything you see, are made of atoms” and he got excited by it. We spin around in circles as atoms and crash into each other to form compounds. I bought him a periodic table and every day he asks what this and that element are, what’s this column called etc. Any info I give is from at chemistry textbooks and general science books from the library. We act things out wherever possible to make the knowledge fun and interactive. I can keep going this way, but maybe people have some suggestions on else we can do?2 points
-
https://www.reuters.com/article/us-space-exploration-nasa/nasa-executive-quits-weeks-after-appointment-to-lead-2024-moon-landing-plan-idUSKCN1SU0A5 - excerpts : " NASA executive quits weeks after appointment to lead 2024 moon landing plan CAPE CANAVERAL, Fla. (Reuters) - A top NASA executive hired in April to guide strategy for returning astronauts to the moon by 2024 has resigned, the space agency said on Thursday, the culmination of internal strife and dwindling congressional support for the lunar initiative. Mark Sirangelo, named six weeks ago as special assistant to NASA Administrator Jim Bridenstine, left the agency as NASA abandoned a reorganization plan due to a chilly reception on Capitol Hill, Bridenstine said in a statement. ... The latest initiative was dubbed Artemis, after the goddess of the hunt and the moon in Greek mythology and the twin sister of Apollo. NASA had aimed to return crewed spacecraft to the lunar surface by 2028, after putting a “Gateway” station into lunar orbit by 2024. However, the prospect of additional funding drew little enthusiasm from congressional appropriators. The two people with knowledge of the matter said Sirangelo’s ouster was sealed by increasing skepticism that 2024 was a realistic deadline for moon landings. In his statement, Bridenstine said the agency was still exploring what organizational changes were “necessary to maximize efficiencies and achieve the end state of landing the first woman and the next man on the moon by 2024.” “If the $1.6 billion does not materialize, we will fall back on the previous plan, which was to land in 2028,” the NASA chief told reporters at a news conference earlier in the day. " https://www.reuters.com/article/us-space-exploration-nasa/nasa-executive-quits-weeks-after-appointment-to-lead-2024-moon-landing-plan-idUSKCN1SU0A51 point
-
https://observer.globe.gov/about/get-the-app More information here (with videos!): https://www.theverge.com/2019/4/15/18308044/nasa-app-point-smartphone-trees-picture-height-satellite-why1 point
-
I started off programming with Python, I found it a relatively easy language to get a grip of, the syntax wasn't difficult to learn and it also has a wide variety of benefits in the real world, and is a very in-demand language, so there's no shortage of work, I'd recommend it certainly as a language to learn if you've never programmed before!1 point
-
You can show him e.g. this video of how photons (i.e. light) interact with atoms: Explain what is in the middle (nucleus), explain composition of nucleus (protons, neutrons, stability, radioactivity, decay energy, disintegration energy). Explain what is around nucleus (electrons), explain shells and sub-shells, how electrons are ejected, and how they are reattached to atom. Exactly. There are websites and desktop or mobile applications where you can enter chemical formula, get name of compound, and in 3D viewport observe and rotate 3D visualization of that molecule. See it from the all sides.1 point
-
https://phys.org/news/2019-05-scientists-mechanisms-formation-moon.html Scientists discover one of the mechanisms of water formation on the moon: The results of a recent study conducted by the NASA Lunar Reconnaissance Orbiter, the agency's automatic interplanetary station, show the existence of 'permafrost' near the poles of the moon with a relatively high content of water ice (up to 5% by weight). It is believed that water ice could supply a life support system for the future Russian Lunar Station, and that it could also produce hydrogen-oxygen fuel for flights into deep space. Researchers from the Higher School of Economics and the Space Research Institute of the Russian Academy of Sciences have discovered one of the mechanisms for how water forms on the moon. Scientists have shown that silver hydroxide molecules are released from silicon dioxide in the lunar regolith (soil). These molecules react easily with hydrogen, leading to the formation of water and silver. This means that water molecules can be formed on the moon. These molecules will become part of the near-surface lunar soil. In some areas, the proportion of water formed by this mechanism in the lunar regolith may exceed 10-6 %. more at link.... the paper: https://link.springer.com/article/10.1134%2FS0010952519020047 Water Formation in the Lunar Regolith: Abstract This study shows that oxygen atoms can be released from a crystal lattice of silicon dioxide in the lunar regolith as parts of silver hydroxide molecules. In turn, silver hydroxide can relatively easily react with hydrogen to generate water and silver. This means that the formation of water molecules involved in near-surface lunar soil is possible. The presence of water molecules in lunar soil can affect the photoelectric properties of the lunar regolith and the parameters of the dusty plasma system over the Moon. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Another article.... https://phys.org/news/2019-05-formation-moon.html For the first time, a cross-disciplinary study has shown chemical, physical, and material evidence for water formation on the moon. Two teams from the University of Hawaiʻi at Mānoa collaborated on the project: physical chemists at the UH Mānoa Department of Chemistry's W.M. Keck Research Laboratory in Astrochemistry and planetary scientists at the Hawai'i Institute of Geophysics and Planetology (HIGP). Although recent discoveries by orbiting spacecraft such as the Lunar Prospector and the hard lander Lunar Crater Observation and Sensing Satellite suggest the existence of water ice at the poles the moon, the origin of this water has remained uncertain. Lunar water represents one of the key requirements for permanent colonization of the moon as a feedstock for fuel and energy generation (hydrogen, oxygen) and also as "drinking water." more at link.... the paper: https://www.pnas.org/content/early/2019/05/14/1819600116 Untangling the formation and liberation of water in the lunar regolith: Significance: Observational evidence collected over the past two decades supports the existence of water on the Moon. However, the sources and chemical and/or physical processes responsible for the production of the lunar water are still unknown. Here, we provide evidence via laboratory simulation experiments that water can be generated and liberated through thermal shocks induced by micrometeorite impacts on solar-wind proton-implanted anhydrous silicates. Our findings are of fundamental importance for explaining the origin of water on the Moon as well as on other airless bodies such as Ceres and for untangling the present distribution of water in our solar system. Abstract: The source of water (H2O) and hydroxyl radicals (OH), identified on the lunar surface, represents a fundamental, unsolved puzzle. The interaction of solar-wind protons with silicates and oxides has been proposed as a key mechanism, but laboratory experiments yield conflicting results that suggest that proton implantation alone is insufficient to generate and liberate water. Here, we demonstrate in laboratory simulation experiments combined with imaging studies that water can be efficiently generated and released through rapid energetic heating like micrometeorite impacts into anhydrous silicates implanted with solar-wind protons. These synergistic effects of solar-wind protons and micrometeorites liberate water at mineral temperatures from 10 to 300 K via vesicles, thus providing evidence of a key mechanism to synthesize water in silicates and advancing our understanding on the origin of water as detected on the Moon and other airless bodies in our solar system such as Mercury and asteroids.1 point
-
My thoughts on the matter, BeeCee... Once a rotating mass collapses to a BH and associated event horizon, classically, there is nothing that actually spins. The event horizon is a mathematical construct, and ( at least classically ) everything else associated with the BH is in the singularity. The conserved angular momentum can be considered intrinsic, similar to quantum particle spin. All other effects would have to be external ( the accretion disc, maybe ) to the event horizon, as lines of force ( magnetic field lines ) cannot travel from inside the EH to the exterior. I had thought that frame dragging might siphon off angular momentum, but I'm not so sure. Any loss of mass would reduce angular momentum, but any existing BHs are gaining mass and it will be a long time before they radiate appreciable quantities of Hawking radiation to start evaporating. ( stellar BHs, the smallest we know of, are way colder than the CMB, and are gaining mass ) Any massive collisions ( other BHs or neutron stars ) that could reduce the angular momentum, would tend to INCREASE the BH's mass-energy and so, the extent of the event horizon. Certainly not reduce it.1 point
-
And you learn a lot from the process. ! Moderator Note Thread closed.1 point
-
I've already been accused of "bitching" about emergence and told that my very presence in this thread inhibits intelligent conversation of AI. (I've seen no evidence of the latter). I respectfully decline to play. I've said several times I don't want to discuss it. I've said my piece and I wouldn't want to inhibit all the insightful and intelligent commentary on AI that I was apparently preventing by my mere presence. Wow. Now you ARE using evolution as a proxy for emergence aka "stuff we don't understand." The bottom line is that when I do respond to my mentions, I get accused of "bitching" and of inhibiting all the world-class commentary on AI that would otherwise ensue if I would just STFU. Then when I DO announce I have nothing else to say on the topic, people complain about that too. Well make up your minds.1 point