Cutting it into smaller sections can be difficult but scoring it with a glass cutter and tapping the… Finer than that, they need to be premixed with water. How to Make Your Own Telescope Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. 60-Second Science - 0 minute ago - By Christopher Intagliata, 60-Second Science - 20 hours ago - By Susanne Bard, 60-Second Science - November 18, 2020 - By Christopher Intagliata, 60-Second Science - November 17, 2020 - By Scott Hershberger, Divide and Conquer Could Be Good COVID Strategy, 60-Second Science - November 12, 2020 - By W. Wayt Gibbs, 60-Second Science - November 10, 2020 - By Mark Stratton, Funky Cheese Rinds Release an Influential Stench. The above text is a transcript of this podcast. Here at the Mirror Lab, we finished making the first Giant Magellan Telescope segment in 2012. Like silver, which reflects 97 to 99 percent of visible and infrared light, respectively. "We in astronomy are always greedy. So Phillips and his team have borrowed a trick from the computer industry, called atomic layer deposition. More photons, he says, basically means more science about incredibly faint, distant objects. When put to use, these better mirrors might allow astronomers to capture more photons… and shed more light—literally—on faraway galaxies and stars. To compute the power or magnification (M) of your telescope, you will use the focal lengths computed in the experiment named, "Focusing Light With a Lens," page 49 in the Educator Guide: Optics - Light, Color and their Uses.Insert the number for each previously computed focal length into the following equation: It's subject to tarnish, and oxidation, and corrosion.". Santa Cruz, —is scaled up to coat mirror segments up to a meter in diameter. ", So you want the most reflective material for your mirrors. But the recent castings of the 15-metric ton, off-axis mirrors for the Giant Magellan Telescope forced engineers to push the design and manufacturing process beyond all previous limits.Read more: https://spectrum.ieee.org/video/aerospace/astrophysics/casting-a-20-million-mirror-for-the-worlds-largest-telescope Observations, Data, and Conclusions. The sheer size of the glass, the nanometer precision of its curves, its carefully calculated optics, and the adaptive software required to run it make this a task of herculean proportions. ], Scientific American Space & Physics is a roundup of the most important stories about the universe and beyond. To study the heavens, it's all about the photons. Subscribers get more award-winning coverage of advances in science & technology. 1. Meaning you could coat all 500 mirrors of a state-of-the-art telescope—like the planned Thirty Meter Telescope—in a matter of months. Christopher Intagliata reports. And unlike the small-scale atomic deposition used in the electronics industry, this new machine--recently installed in a lab at U.C. —and do more science. Bounce that light around a few times in a telescope, and you lose valuable photons. Shake well before pouring the grit on the mirror. And mirrors aren't perfectly reflective. Because incoming light reflects off several mirrors before it comes out the business end of a telescope. [The above text is a transcript of this podcast. Take a plastic bottle (from drinks etc) 0.5 liters, add a few spoons of grit in the bottle and add 6-8 times the volume of water. In this post, we’ll talk about the first one which is the most time consuming but also the most interesting. —literally—on faraway galaxies and stars. Meaning you could coat all 500 mirrors of a state-of-the-art telescope—like the planned Thirty Meter Telescope—in a matter of months. Santa Cruz—is scaled up to coat mirror segments up to a meter in diameter. Christopher Intagliata reports. We want every photon we can collect." I began building it in the spring of 2008, but the bulk of the work was done in July of 2008 with first light occurring on July 25. © 2020 Scientific American, a Division of Springer Nature America, Inc. Support our award-winning coverage of advances in science & technology. So Phillips and his team have borrowed a trick from the computer industry, called atomic layer deposition. It was 40"x40" and 0.75" thick. After a pause for work on two other mirrors, the lab is in the process of grinding Segments 2 and 3. It starts to look like a telescope mirror :) The #400 grit is the finest size you will add with the teaspoon. Building a mirror for any giant telescope is no simple feat. More reflective telescope mirrors allow astronomers to capture more photons—and do more science. Homemade 12.5 Inch Dobsonian Telescope: How to build a 12.5 inch closed tube Dobsonian telescope. "The throughput, the actual number of photons that are detected in the end in a modern spectrograph, you're doing good if you get thirty percent. Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at, More reflective telescope mirrors allow astronomers to capture more photons. [, When put to use, these better mirrors might allow astronomers to capture more photons… and shed more light. —and coat it with extremely uniform layers of transparent aluminum oxide, to protect against corrosion. Building a reflector telescope can be decomposed in 2 steps: make the mirror and build the tube/mount. But silver's got problems too. The traditional mirror coating, aluminum, reflects only about 90 percent of light. Big improvement over aluminum. And unlike the small-scale atomic deposition used in the electronics industry, this new machine--recently installed in a lab at U.C. Its what I decided to use to make the mirror. And that's where the optics problem comes in. This Instructable describe the planning, design, and par… Drew Phillips, astronomer at University of California Observatories. The traditional mirror coating, aluminum, reflects only about 90 percent of light. The technique allows them to take a silver-coated mirror. "It is finicky. [Journal of SPIE]. Casting a $20 Million Mirror for the World’s Largest Telescope Bounce that light around a few times in a telescope, and you lose valuable photons. The technique allows them to take a silver-coated mirror—and coat it with extremely uniform layers of transparent aluminum oxide, to protect against corrosion.
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