1. Transformer Binary Pulsar System

    02:53

    from Cruz deWilde / Added

    In late June 2013, an exceptional binary system containing a rapidly spinning neutron star underwent a dramatic change in behavior never before observed. The pulsar's radio beacon vanished, while at the same time the system brightened fivefold in gamma rays, the most powerful form of light, according to measurements by NASA's Fermi Gamma-ray Space Telescope. The system, known as AY Sextantis, is located about 4,400 light-years away in the constellation Sextans. It pairs a 1.7-millisecond pulsar named PSR J1023+0038 -- J1023 for short -- with a star containing about one-fifth the mass of the sun. The stars complete an orbit in only 4.8 hours, which places them so close together that the pulsar will gradually evaporate its companion. To better understand J1023's spin and orbital evolution, the system was routinely monitored in radio. These observations revealed that the pulsar's radio signal had turned off and prompted the search for an associated change in its gamma-ray properties. What's happening, astronomers say, are the last sputtering throes of the pulsar spin-up process. Researchers regard the system as a unique laboratory for understanding how millisecond pulsars form and for studying details of how accretion takes place on neutron stars. In J1023, the stars are close enough that a stream of gas flows from the sun-like star toward the pulsar. The pulsar's rapid rotation and intense magnetic field are responsible for both the radio beam and its powerful pulsar wind. When the radio beam is detectable, the pulsar wind holds back the companion's gas stream, preventing it from approaching too closely. But now and then the stream surges, pushing its way closer to the pulsar and establishing an accretion disk. When gas from the disk falls to an altitude of about 50 miles (80 km), processes involved in creating the radio beam are either shut down or, more likely, obscured. Some of the gas may be accelerated outward at nearly the speed of light, forming dual particle jets firing in opposite directions. Shock waves within and along the periphery of these jets are a likely source of the bright gamma-ray emission detected by Fermi.

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    • Pulsar's Double-Peaked Gamma Emission

      00:33

      from Cruz deWilde / Added

      A pulsar is a rapidly spinning and highly magnetized neutron star, the crushed core left behind when a massive sun explodes. Most were found through their pulses at radio wavelengths, which are thought to be caused by narrow, lighthouse-like beams emanating from the star's magnetic poles. When it comes to gamma-rays, pulsars are no longer lighthouses. A new class of gamma-ray-only pulsars shows that the gamma rays must form in a broader region than the lighthouse-like radio beam. Astronomers now believe the pulsed gamma rays arise far above the neutron star. Above Caption: Courtesy of NASA Music: Wonder Cycle by Chris Zabriskie (http://chriszabriskie.com)

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      • The Lives of Stars - Professor Carolin Crawford

        58:25

        from Gresham College / Added

        30 Plays / / 0 Comments

        Professor Carolin Crawford answers every question you've ever had about the most romantic stellar bodies, the stars: http://www.gresham.ac.uk/lectures-and-events/the-lives-of-stars Stars are an ubiquitous feature of our local Galactic environment. They do not last forever -- but form, develop and evolve over timescales of millions or billions of years, eventually to expire in dramatic style. We look at the lifecycles of different kinds of stars, and in particular, what they reveal about our own origins. The transcript and downloadable versions of the lecture are available from the Gresham College website: http://www.gresham.ac.uk/lectures-and-events/the-lives-of-stars Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 1,500 lectures free to access or download from the website. Website: http://www.gresham.ac.uk Twitter: http://twitter.com/GreshamCollege Facebook: https://www.facebook.com/greshamcollege

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        • About Stars

          03:02

          from Brent Ebell / Added

          113 Plays / / 0 Comments

          This is an info graphic about stars that I made for a motion graphics class. I used After Effects CS6 with trapcode and Knoll light factory plug-ins. Please excuse the voice-over, as I have a terrible broadcast voice! And yes, there is a lot of information that I skipped over just to keep it short. The true purpose of the video was to demonstrate my understanding of After Effects and info graphics. As usual, the music was provided by Kevin MacLeod...I think.

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          • Neutron stars – a melting pot for atomic nuclei

            04:01

            from Ilka Brosch / Added

            80 Plays / / 0 Comments

            Neutron stars are extraordinary objects in the universe. Their density is so high that atoms melt within them and new states of matter arise. Tetyana Galatyuk and her colleagues try to simulate these conditions at the smallest scale using the FAIR particle accelerator and observe the results with the CBM detector. Thus, they not only learn more about neutron stars, but also about the innermost structure of matter. I did the animation for the Beilstein-Institut zur Förderung der Chemischen Wissenschaften. Filmed at the GSI Helmholtzzentrum für Schwerionenforschung. Produced by kemweb.tv

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            • Star Life Cycles

              02:16

              from Millmark Education / Added

              Here are words that will be helpful to students doing a hands-on science inquiry to research stars at various stages in the star life cycle and share their findings using a jigsaw format. They relate their findings to the Essential Question: How do stars change throughout their life cycles?

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              • Endeavor: Our Mist

                10:02

                from Hannah Joseph-Alvarado / Added

                14 Plays / / 0 Comments

                This video is about our exploration and understanding of space, how there is an irony that we think we know what is out there but cannot be certain until we go out into space ourselves. Until we endeavor out into deep space the knowledge we think we know lay in mists that can change at a whim. Major influences include Stan VanDerBeek and Phil Solomon.

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                • The Turkey Reloaded - Part 3

                  03:08

                  from SBProductions / Added

                  22 Plays / / 0 Comments

                  The third installment of the epic turkey saga. The turkey fighting duo is united once again and are poised to unleash their newest plan against the fledgling turkey empire. Who will prevail in the war to end all wars?

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                  • ScienceCasts: Superfluids

                    02:47

                    from Science@NASA / Added

                    1,666 Plays / / 0 Comments

                    Visit http://science.nasa.gov/ for more! Strange quantum fluids that love to sneak out of cups have been found trapped inside the core of a dead neutron star.

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                    • Ringing neutron star: cut through the equator

                      00:42

                      from Burkhard Zink / Added

                      127 Plays / / 0 Comments

                      This neutron star model has been perturbed with a nonaxisymmetric (l = 2, m = 2) quadrupole mode, which leads to two deformation waves traveling in both prograde and retrograde directions. One of these waves, the counterrotating mode, becomes unstable to the emission of gravitational radiation if the star is spinning rapidly enough.

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