James Webb Telescope

I found this article titled, “NASA’s James Webb Space Telescope: Hubble’s Cosmic Successor”.  The NASA’s James Webb Space Telescope, is scheduled to launch in 2018, it will probe the cosmic to uncover the history of the universe from the Big Bang to alien planet formation and beyond. The James Webb Space Telescope (JWST) will launch on a Ariane five rocket from France Guiana, then take thirty days to fly a million miles to its permanent home, a Lagrange point, or a gravitationally stable location in space. It will orbit around L2, a spot in space near Earth that lies opposite from the sun. This has been a popular spot for several other space telescopes, including the Herschel Telescope, and the Planck Space Observatory. The powerful $8.8 billion spacecraft is also expected to take amazing photos of celestial objects like its predecessor, the Hubble Space Telescope. JWST is divided into four areas, first light and reionization, assembly of galaxies, birth of stars and protoplanetary system, and finally planets and origins of life. JWST will be equipped with four specific science instruments an infrared camera(NIRCam), near-infrared spectrograph(NIRSpec), mid-infrared instrument(MIRI), and fine guidance sensor/near infrared imager and slitless spectrograph(FGS/NIRISS).

The ninth conceptual objective is, I can describe a.) the function of a telescope, b.) types of telescopes, and c.) why some telescopes are placed on the ground and some are in space. The function of many telescope starts with a refraction which is light being bent through air or water. The refraction is located in the lenses which is rounded surface so it can focus light at one specific spot. With the combination of two lenses with difference focal length creates magnification. And the aperture is the lenses that collects and concentrate light to a diameter. Along with the angular resolution which is the ability to see objects that are close together, and with the larger aperture a telescope has the better resolution it gets. There are two types of telescopes you can physically look through to see stars and planets. Which are refractor and reflector telescopes. Refractor telescopes have good resolution good for detail, rugged alignment, and transport well. And reflector telescopes have inexpensive optics, large aperture, uniform treatment of colors, portable size, and is good for photographs. Some other types of telescopes are radio telescopes which us radio waves to send electromagnetic radiation, radio dish which uses a focal point can b above or in a dish and an antenna is used instead of a cameras, telescope array which is two or more telescopes in the same location, Very Long Baseline Interferometry(VIBI) which combines radio signals from a telescopes all around the earth. Some telescopes are located on earth and some are located in space, we learned about this on pages 51 threw 53 in our lecture tutorial book. Which has a diagrams showing how far the wave length travel. With the shortest being X-rays to the longest being visible light and radio waves. The reason astronomers put certain telescopes in certain spots is because some are safer to have in space because it will not hurt people on earth. This is why people who work on airplanes are limited on the time they can spend in the sky.

JWST is the new age of telescopes, it is going to be a great tool scientist can use to explore space. This article relates to what we learned in class, like how it works, what instruments it will used, and why its going to space rather than being on earth. Learning about telescopes made it easy to read about this and will make it easier to read and hear about in the future.


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