*********Week 4 August************
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Carla Parsons Daniel Cantü Christopher S. Jannette Kostas Hatalis ... See MoreSee Less
Radical Science NewsOur Launch, please check it out. www.rockethub.com/projects/47911-radical-science-news-launch3 years ago · 2
*******RSN UPDATE - August (week 4) **********
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*******RSN UPDATE - August **********
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According to recent reports, 2013 was a bumper year for renewable energy, with more wind turbines and solar panels installed in more places around the world than ever before. Read more: bit.ly...
Gliese15Ab, Newly Announced Super-Earth May Be The Closest Exoplanet Discovered Yet
Gliese15Ab is a newly discovered planet roughly five times the mass of Earth. Researchers aren't sure what the planet's atmosphere is like, and it's close enough to its parent star to heat it past the boiling point of water. But the most interesting thing about Gliese 15Ab isn't how close it is to its star. It's how close it is to us.
The interesting bit is that its host star, Gl 15A, is a mere 11.7 light years from Earth. It's one of the 20 closest stellar systems known, making GL 15Ab quite possibly the closest known exoplanet!
Gliese 15 is a binary star, two cool, dim red dwarfs orbiting each other. Red dwarfs are the most common type of star in the galaxy, but they're so intrinsically faint that not a single one is visible to the naked eye; you need a telescope to see them. The closest star to the Sun we know of, Proxima Centauri, is only 4.2 light years away and even then too faint to see without using at least good binoculars.
Gliese 15 A and B (as the two stars are called, or just Gl 15A and B for short) orbit each other at a distance of about 22 billion kilometers, which is five times the distance Neptune orbits the Sun, so they're pretty far apart. The planet discovered has a very tight orbit around the brighter of the two stars, Gl 15A, circling it a mere 11 million kilometers out. That's close. Even though the star itself is a dim bulb, the planet is so near to it that it's heated to at least the boiling point of water, and possibly hotter.
The biggest takeaway from this announcement doesn't even have to do with Gliese15Ab – at least not directly. It has to do with the fact that this planet is one of many, many confirmed and candidate exoplanets being discovered at an increasing rate. The Milky Way is thought to contain billions of Earth-like worlds, as many as 60 billion of which are believed to orbit red dwarfs like Gliese15A. Discoveries like this remind us that these unfathomably huge estimates are based in more than theory. The exoplanets are out there, waiting to be discovered. And some of them, like Gliese15Ab, may be hiding right in our back yard.
Image Credit: NASA, ESA, and D. Aguilar (Harvard-Smithsonian Center for Astrophysics
io9.com/newly-announced-super-earth-may-be-the-closest-exoplane-1628480191?utm_campaign=socialflo... ... See MoreSee Less
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HOMENAJE A JOHN
DARPA project to develop revolutionary miniaturization and assembly methods at scales a 100,000 times smaller than current state-of-the-art technology
Atom to Product (A2O) to help overcome the challenges of working from the nanoscale to 100 microns
These “atomic scale” or “nanoscale” properties include quantized electrical characteristics, glueless adhesion, rapid temperature changes, and tunable light absorption and scattering that, if available in human-scale products and systems, could offer potentially revolutionary defense and commercial capabilities.
www.darpa.mil/NewsEvents/Releases/2014/08/22.aspx ... See MoreSee Less
Radical Science News added 4 new photos.
"..Inside stars like the sun, the extreme temperature rips atoms into their components: protons, neutrons and electrons. Under normal conditions, the mutual repulsion of individual protons ought to force them apart. Quantum-tunneling effects in the sun allow hot, high-speed protons to fuse into helium nuclei. This fusion reaction drives the sun’s radiance...'
"....nuclear fusion is a nuclear reaction in which two or more atomic nuclei collide at a very high speed and join to form a new type of atomic nucleus. During this process, matter is not conserved because some of the matter of the fusing nuclei is converted to photons (energy). Fusion is the process that powers active or "main sequence" stars.
The fusion of two nuclei with lower masses than iron (which, along with nickel, has the largest binding energy per nucleon) generally releases energy, while the fusion of nuclei heavier than iron absorbs energy. The opposite is true for the reverse process, nuclear fission. This means that fusion generally occurs for lighter elements only, and likewise, that fission normally occurs only for heavier elements. There are extreme astrophysical events that can lead to short periods of fusion with heavier nuclei. This is the process that gives rise to nucleosynthesis, the creation of the heavy elements during events such as supernovae. Following the discovery of quantum tunneling by Friedrich Hund, in 1929 Robert Atkinson and Fritz Houtermans used the measured masses of light elements to predict that large amounts of energy could be released by fusing small nuclei. Building upon the nuclear transmutation experiments by Ernest Rutherford, carried out several years earlier, the laboratory fusion of hydrogen isotopes was first accomplished by Mark Oliphant in 1932. During the remainder of that decade the steps of the main cycle of nuclear fusion in stars were worked out by Hans Bethe. Research into fusion for military purposes began in the early 1940s as part of the Manhattan Project. Fusion was accomplished in 1951 with the Greenhouse Item nuclear test. Nuclear fusion on a large scale in an explosion was first carried out on November 1, 1952, in the Ivy Mike hydrogen bomb test....."
►http://en.wikipedia.org/wiki/Nuclear_fusion ... See MoreSee Less
Alexandra Mihut likes this
Peter SpriggsIts a bit of a shame that the seemingly most obvious fusion reaction (aneutronic) is one of those that governments are ignoring in favour of more difficult and costly methods. Aneutronic creates ions and xrays which can generate an electric charge, whereas the government funded programs just produce a lot of heat (and contrary to popular belief also a good chunk of radiation)3 years ago
Radical Science News shared World Economic Forum's photo.
How will technology change the world by 2020? Predictions from this year's World Economic Forum Tech Pioneers:
wef.ch/1svwdM6 ... See MoreSee Less
How will technology change the world by 2020? Twelve predictions from this year's World Economic Forum Tech Pioneers: wef.ch/1svwdM6
Ubiquitous Data : The impact of our digital footprints, what they can be used for, and how they reveal surprising details about human behavior.
Andreas Weigend, former Chief Scientist at Amazon and Lecturer at Stanford University, discusses and reflects. ... See MoreSee Less
www.weigend.com - Andreas Weigend, former Chief Scientist at Amazon and Lecturer at Stanford University, discusses and reflects on the impact of socia...
[courtesy of Our Universe fp]
"After a decade in space and 4 billion miles, Europe's Rosetta spacecraft has made history: For the first time ever, a robotic probe from Earth is flying with a comet and will soon enter orbit. The European Space Agency's Rosetta spacecraft arrived at its target, Comet 67P/Churyumov-Gerasimenko, today (Aug. 6) to end a 10-year journey across the solar system. The spacecraft performed an engine burn that brought it about 62 miles (100 kilometers) from the comet's surface. Comet 67P/C-G and Rosetta are now flying about 251 million miles (450 million kilometers) from Earth. Engineers on the ground had to program the probe to go through a series of complicated burns and maneuvers to make the spacecraft's rendezvous with the comet a possibility. [Photos: Europe's Rosetta Comet Mission in Pictures] "This is the end of 10 years of interplanetary flight," Rosetta Flight Director Andrea Accomazzo said during ESA's live comet rendezvous webcast Wednesday. Applause broke out in Rosetta's mission control center in Darmstadt, Germany, where a crowd of ESA dignitaries and officials had gathered to watch the historic event. "We're at the comet! Yes!" exclaimed Sylvain Lodiot, Rosetta's spacecraft operations manager, once the probe's successful arrival at Comet 67P/C-G was confirmed. Now, Rosetta controllers will scope out different spots on the comet, to find a good place to land the Philae lander, a small spacecraft that is expected to touch down on the surface of the comet this November. Philae will drop to the comet's surface..." ... See MoreSee Less