We bet you have long suspected this: Hubble “public” images are not what the telescope sees. There are three types of cones and they are most sensitive to Red, Green and Blue light. Our eyes have special receptors, called cones, that are responsible for the colour perception. Every two of them mixed together produce secondary colours, cyan, yellow or magenta. The three added together make white light. Red, Green and Blue are the three “additive primary colours of light”. The filter colours were not chosen randomly. But the core idea, combining different filter exposures to make a colour photo, is the same as in modern astro photos. Of course, Maxwell’s “tartan ribbon” looked rather blurry and dull, nothing like the majestic Hubble images we admire today. The images were printed on glass plates and projected using 3 projectors (with the same color filters as photographs) on top of one another to produce a full color image. To create the photo, three separate images of the tartan ribbon were made with green, blue and red filters over the lens. The image, known as “The tartan ribbon” was made using Maxwell’s three-colour technique. The magic of the Hubble images goes back to the end of the 19th century when the Scottish physicist James Clerk Maxwell presented the world’s first colour photo. In other words, we want to know how the astronomical images are made! Those multicoloured swirls of gas sprinkled with shiny stars, galaxies dotted all over the inky black background…īut is it what the Hubble Telescope actually sees? Or are these images a result of careful colouring, enhancing and other processing techniques? And, if so, how scientifically accurate the resulting pictures are? Robberto (Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team The Orion observations were taken between 20.From research data to a piece of art: this is how the colourful Hubble images are made The ACS mosaic covers approximately the apparent angular size of the full moon. They also added ground-based photos to fill out the nebula. Astronomers used 520 Hubble images, taken in five colours, to make this picture. The Orion Nebula is 1,500 light-years away, the nearest star-forming region to Earth. The dark red column, below, left, shows an illuminated edge of the cavity wall. Sometimes called "failed stars," brown dwarfs are cool objects that are too small to be ordinary stars because they cannot sustain nuclear fusion in their cores the way our Sun does. The faint red stars near the bottom are the myriad brown dwarfs that Hubble spied for the first time in the nebula in visible light. The glowing region on the right reveals arcs and bubbles formed when stellar winds - streams of charged particles ejected from the Trapezium stars - collide with material. These pillars are resisting erosion from the Trapezium's intense ultraviolet light. Next to M43 are dense, dark pillars of dust and gas that point toward the Trapezium. Astronomers call the region a miniature Orion Nebula because only one star is sculpting the landscape. The bright glow at upper left is from M43, a small region being shaped by a massive, young star's ultraviolet light. The disks are the building blocks of solar systems. These disks are called protoplanetary disks or "proplyds" and are too small to see clearly in this image. Located near the Trapezium stars are stars still young enough to have disks of material encircling them. Ultraviolet light unleashed by these stars is carving a cavity in the nebula and disrupting the growth of hundreds of smaller stars. The stars are called the Trapezium because they are arranged in a trapezoid pattern. The bright central region is the home of the four heftiest stars in the nebula. The Orion Nebula is a picture book of star formation, from the massive, young stars that are shaping the nebula to the pillars of dense gas that may be the homes of budding stars. These stars reside in a dramatic dust-and-gas landscape of plateaus, mountains, and valleys that are reminiscent of the Grand Canyon. Some of them have never been seen in visible light. More than 3,000 stars of various sizes appear in this image. The image, taken by the Advanced Camera for Surveys (ACS) aboard NASA/ ESA Hubble Space Telescope, represents the sharpest view ever taken of this region, called the Orion Nebula. This dramatic image offers a peek inside a cavern of roiling dust and gas where thousands of stars are forming.
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