What exactly happens when two large galaxies collide with one another? Any image of a galaxy collision captures only one instant in a collision process lasting a billion-years ? a gradual waltz of stars and gas choreographed by gravity. This visualisation of a galaxy collision created by a supercomputer simulation shows the entire collision sequence, and compares the different stages of the collision with different interacting galaxy pairs observed by the NASA/ESA Hubble Space Telescope. With this combination of research simulations and high resolution observations, these titanic crashes can be better understood.Crossfades between different merging galaxies from a collection of fifty nine new images of colliding galaxies, the largest collection of Hubble images ever released together. As this astonishing Hubble atlas of interacting galaxies illustrates, galaxy collisions produce a remarkable variety of intricate structures. Credit: NASA, ESA, F. Summers (STScI), the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University), K. Noll (STScI), and J. Westphal (Caltech) Empty Galaxies-589 CSILLAGKÃ--D Subscribe for more Space wonders on ΥουΤυbe: https://tinyurl.com/SpaceTelescopesYouTube #space #astrophysics #universe ... https://www.youtube.com/watch?v=UgGhzqzMmQc

A trip to Earth's geologic history. How Earrth was look like 4.5 billion years ago and how it will some million years from today. Reconstruction of the Earth in the past. Credit: Dr Ron Blakey, NAU Geology. Mother Earth Terry Devine Subscribe for more Space wonders on ΥουΤυbe: https://tinyurl.com/SpaceTelescopesYouTube #space #astrophysics #universe ... https://www.youtube.com/watch?v=nEZi7fsZikE

A new model is bringing scientists a step closer to understanding the kinds of light signals produced when two supermassive black holes, which are millions to billions of times the mass of the Sun, spiral toward a collision. For the first time, a new computer simulation that fully incorporates the physical effects of Einstein’s general theory of relativity shows that gas in such systems will glow predominantly in ultraviolet and X-ray light. The new simulation shows three orbits of a pair of supermassive black holes only 40 orbits from merging. The models reveal the light emitted at this stage of the process may be dominated by UV light with some high-energy X-rays, similar to what’s seen in any galaxy with a well-fed supermassive black hole. Three regions of light-emitting gas glow as the black holes merge, all connected by streams of hot gas: a large ring encircling the entire system, called the circumbinary disk, and two smaller ones around each black hole, called mini disks. All these objects emit predominantly UV light. When gas flows into a mini disk at a high rate, the disk’s UV light interacts with each black hole’s corona, a region of high-energy subatomic particles above and below the disk. This interaction produces X-rays. When the accretion rate is lower, UV light dims relative to the X-rays. Based on the simulation, which ran on the National Center for Supercomputing Applications’ Blue Waters supercomputer at the University of Illinois at Urbana-Champaign, the researchers expect X-rays emitted by a near-merger will be brighter and more variable than X-rays seen from single supermassive black holes. The pace of the changes links to both the orbital speed of gas located at the inner edge of the circumbinary disk as well as that of the merging black holes. https://svs.gsfc.nasa.gov/13043 #space #astrophysics #universe ... https://www.youtube.com/watch?v=jqWywhVxfTQ

On August 31, 2012 a long filament of solar material that had been hovering in the sun's atmosphere, the corona, erupted out into space at 4:36 p.m. EDT. The coronal mass ejection, or CME, traveled away from the sun at over 900 miles per second. This movie shows the ejection from a variety of viewpoints as captured by NASA's Solar Dynamics Observatory (SDO), NASA's Solar Terrestrial Relations Observatory (STEREO), and the joint ESA/NASA Solar Heliospheric Observatory (SOHO). This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/goto?11095 Subscribe for more Space wonders on ΥουΤυbe: https://tinyurl.com/SpaceTelescopesYouTube #space #astrophysics #universe ... https://www.youtube.com/watch?v=0dDU4YwY9m0