The Ties that Bind

  Sep 23, 2015 Earth and the Sun are joined together. The four Magnetospheric Multiscale Satellites (MMS) were launched March 12, 2015 on a mission to study the magnetic field around Earth, especially what scientists like to call “magnetic reconnection” events. According to the theory, when magnetic field lines cross…

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Plasma Star

  Sep 22, 2015 Recent images of the star CH Cygni reveal the electrical circuitry that drives it. Radiation in radio (blue), optical (green), and X-ray (red) highlight the several inner components of the plasma discharge. The outer red circle (large optical image) is composed of radial filaments. This is a…

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Petrified Thoughts

  Sep 21, 2015 Earth should not be used to explain the Solar System. Previous Pictures of the Day discuss dune-like formations in various locales, except they are seen on other celestial bodies, such as Saturn’s planet-sized moon, Titan. Along with the extraterrestrial example, Australia’s Simpson desert contains 1240 parallel,…

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Heat Death

  Sep 18, 2015 Is it going to be a dark future? “Don’t wake me for the end of the world unless it has very good special effects.” — Roger Zelazny Since the early days of cosmological speculations, especially after the introduction of Big Bang theory, three competing ideas about…

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The Basics

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  Sep 17, 2015 Imagine a rock. Now, imagine breaking it into pieces. Break the pieces into smaller pieces. Continue breaking until your eyes can no longer resolve the pieces. Get a microscope. Now you can distinguish the pieces. Break them until the microscope can no longer resolve the parts. Get…

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Swan Song

  Sep 16, 2015 Electrical activity creates the nova phenomenon. A nova explosion is thought to take place when a smaller white dwarf star in orbit around a larger companion draws matter onto its surface. Gravity compresses the gas and dust until, at a critical threshold the accreted material reaches…

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The Ring is a Barrel

  Sep 15, 2015 The Ring Nebula could be called the “Tube Nebula”. “Bipolar outflow” is a term often used to describe the nebular structure seen above, although the cause of the effect remains baffling to consensus astronomers. The prevailing opinion is that nebular structures form “knots” because gases and…

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