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Astronomy and Space Science Chapter 4: Stars, Galaxies, and the Universe Lesson 1: Telescopes

Astronomy and Space Science Chapter 4: Stars, Galaxies, and the Universe Lesson 1: Telescopes (Part 2). By: Alissa Foy, Alyssa Risch, and Sydney Demos. Telescopes and How They Work. Telescopes: instruments that collect and focus light and other forms of electromagnetic radiation

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Astronomy and Space Science Chapter 4: Stars, Galaxies, and the Universe Lesson 1: Telescopes

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  1. Astronomy and Space Science Chapter 4: Stars, Galaxies, and the Universe Lesson 1: Telescopes (Part 2) By: Alissa Foy, Alyssa Risch, and Sydney Demos

  2. Telescopes and How They Work Telescopes: instruments that collect and focus light and other forms of electromagnetic radiation Types of Telescopes: 1. Optical Telescopes: telescopes that use lenses or mirrors to collect and focus visible light. 2. Nonoptical Telescopes: telescopes that collect and focus different types of electromagnetic radiation Observatory: a building that contains one or more telescopes These infrared images were taken by the Spitzer Space Telescope, not an optical telescope. We wouldn't be able to see these without the help of telescopes!

  3. Types of Optical Telescopes: The Refracting Telescope REFRACTING = LENSES • Has LENSES • Uses a convex lens to focus light -Convex Lens: a piece of glass that is curved, so the middle is thicker than the edges • Larger objective lens = the telescope can collect more light This convex objective lens focuses the light and makes it easier to see! This eyepiece lens magnifies the image from the other lens!

  4. Types of Optical Telescopes: The Reflecting Telescope REFLECTING = MIRRORS • Has MIRRORS • Made by Isaac Newton in 1668 • Uses a curved mirror to focus light • Larger objective mirror = the telescope can collect more light • REFLECTING TELESCOPES ARE THE LARGEST TELESCOPES This eyepiece lens magnifies the image from the mirrors! This curved objective mirror focuses the light onto the next mirror! This mirror reflects that light into the eyepiece!

  5. Why are the largest optical telescopes always reflecting telescopes? Here's the answer: Video Subtitles: The reflecting telescope will always be the biggest optical telescope because the mirror can be supported from the back, like this. However, the refracting telescope has a lens, and the lens has to be held like this so that light can pass through, but it could easily fall out like that.

  6. Telescopes and How They Work continued Types of Nonoptical Telescopes: 1. Radio telescopes: telescopes that detect radio waves from objects in space; found in valleys 2. Spitzer Space Telescope: a telescope that produces images in the infrared portion of the spectrum 3. Chandra X-ray Observatory: a group of telescopes that produces images in the X-ray portion of the spectrum; found in outer space 3. 1. 2.

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