Why not all galaxies? Galaxy? Such a name? Well, first of all, the galaxy? This name was not originally the name of our galaxy. Thousands of years ago, when the ancient Greeks and Romans came up with this name, they didn't know what a galaxy was or that we were a part of it. They only saw a white stripe across the night sky, imagining that it was the galactic track of something: photos taken by Thomas Ciszewski, source wallpaper sharing software, and other galaxies with unique characteristics, which we named? Is it cool? The name of. Like what? Straw hat? Galaxy: What else? The spiral galaxy is the third. In the observable universe, it is estimated that there are 2 trillion galaxies at present: 20 16 years. A study led by Christopher Kang Scherlies of Nottingham University was published in the Journal of Astrophysics. This study uses the images collected by Hubble Space Telescope for more than 20 years to build a three-dimensional model, and draws the conclusion that there are more than 2 trillion (twice) galaxies in hubble volume. Galaxies-Wikipedia has so many galaxies! In order to let you know how many, as early as 2003, NASA aimed the Hubble telescope at a tiny area that looked completely dark to the naked eye. This is the image they managed to capture: of course, you can see a bunch of obvious galaxies in the picture, but you need to understand that almost every light spot you see is a galaxy (the total number * * * exceeds 654.38 million). All this means that we can't even count on classifying all the galaxies in the Hubble volume, let alone naming them? Is it cool? The name of. Related knowledge Hubble deep space is a small area sky image taken by Hubble Space Telescope. The shooting location is in Ursa Major, covering only 2.6 arc minutes, accounting for a quarter of the whole day area, which is about the size of a tennis ball at 100 meters away. The images were superimposed and spliced by the second generation wide-area and planetary cameras on the Hubble Space Telescope, with a total of 342 exposures, and the shooting time was 1995 12 18 to 28 * * for ten consecutive days.