Wikipedia picture of the day on February 25, 2018: Anděl metro station in Prague, Czech Republic. Wikipedia"
Saturday, February 24, 2018
Friday, February 23, 2018
Wikipedia picture of the day on February 24, 2018: Cassius blue butterfly (Leptotes cassius theonus), Artemisa, Cuba. On February 24 2008, Raúl Castro, was declared the new President, taking over from his brother Fidel Castro Wikipedia"
Thursday, February 22, 2018
Wednesday, February 21, 2018
Wikipedia picture of the day on February 22, 2018: A Black Brant IX sounding rocket launches from the Poker Flat Research Range in Alaska at 5:14 a.m. EST, Feb. 22, 2017. This is the first of two launches planned in NASA's In Situ and Groundbased Low Altitude StudieS (ISINGLASS) mission to study the structures of auroras. Wikipedia"
Tuesday, February 20, 2018
Monday, February 19, 2018
Sunday, February 18, 2018
How did we get here? We know that we live on a planet orbiting a star orbiting a galaxy, but how did all of this form? To understand details better, astrophysicists upgraded the famous Illustris Simulation into IllustrisTNG -- now the most sophisticated computer model of how galaxies evolved in our universe. Specifically, this featured video tracks magnetic fields from the early universe (redshift 5) until today (redshift 0). Here blue represents relatively weak magnetic fields, while white depicts strong. These B fields are closely matched with galaxies and galaxy clusters. As the simulation begins, a virtual camera circles the virtual IllustrisTNG universe showing a young region -- 30-million light years across -- to be quite filamentary. Gravity causes galaxies to form and merge as the universe expands and evolves. At the end, the simulated IllustrisTNG universe is a good statistical match to our present real universe, although some interesting differences arise -- for example a discrepancy involving the power in radio waves emitted by rapidly moving charged particles. via NASA
Wikipedia picture of the day on February 19, 2018: Snow polo match between the teams of Cartier (in red) and Ralph Lauren (in black) at the 30th edition of the Snow Polo World Cup, celebrated in February 2014 in St. Moritz, Switzerland. Wikipedia"
Saturday, February 17, 2018
Stars can make waves in the Orion Nebula's sea of gas and dust. This esthetic close-up of cosmic clouds and stellar winds features LL Orionis, interacting with the Orion Nebula flow. Adrift in Orion's stellar nursery and still in its formative years, variable star LL Orionis produces a wind more energetic than the wind from our own middle-aged Sun. As the fast stellar wind runs into slow moving gas a shock front is formed, analogous to the bow wave of a boat moving through water or a plane traveling at supersonic speed. The small, arcing, graceful structure just above and left of center is LL Ori's cosmic bow shock, measuring about half a light-year across. The slower gas is flowing away from the Orion Nebula's hot central star cluster, the Trapezium, located off the upper left corner of the picture. In three dimensions, LL Ori's wrap-around shock front is shaped like a bowl that appears brightest when viewed along the "bottom" edge. This beautiful painting-like photograph is part of a large mosaic view of the complex stellar nursery in Orion, filled with a myriad of fluid shapes associated with star formation. via NASA