* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download VI. Preferred Location of Telescopes
Arecibo Observatory wikipedia , lookup
Allen Telescope Array wikipedia , lookup
Lovell Telescope wikipedia , lookup
Hubble Space Telescope wikipedia , lookup
James Webb Space Telescope wikipedia , lookup
Spitzer Space Telescope wikipedia , lookup
CfA 1.2 m Millimeter-Wave Telescope wikipedia , lookup
Optical telescope wikipedia , lookup
International Ultraviolet Explorer wikipedia , lookup
Telescopes I. Refraction: Refraction is the _____________ of light as it passes through glass. II. Reflection: Reflection occurs when light _____________ off of a mirror. F f I. Refraction: Refraction is the ___bending____ of light as it passes through glass. II. Reflection: Reflection occurs when light _____________ off of a mirror. F f I. Refraction: Refraction is the ___bending____ of light as it passes through glass. glass lens focal point focal length II. Reflection: Reflection occurs when light _____________ off of a mirror. F f I. Refraction: Refraction is the ___bending____ of light as it passes through glass. glass lens focal point focal length II. Reflection: Reflection occurs when light ___bounces ___ off of a mirror. F f I. Refraction: Refraction is the ___bending____ of light as it passes through glass. glass lens focal point focal length II. Reflection: Reflection occurs when light ___bounces ___ off of a mirror. focal point mirror F f focal length Light focuses at different points. Light focuses at one point!! Chromatic Aberration with Glass Lenses Bad news!! Remember Newton’s prism! III. Telescopes: A. A ____________ telescope uses glass lenses to collect and focus the light. B. The primary component of a ____________ telescope that collects and focuses the light is a mirror. III. Telescopes: A. A _refracting__ telescope uses glass lenses to collect and focus the light. main objective B. The primary component of a ____________ telescope that collects and focuses the light is a mirror. III. Telescopes: A. A __refracting__ telescope uses glass lenses to collect and focus the light. main objective B. The primary component of a __reflecting__ telescope that collects and focuses the light is a mirror. main objective IV. Two Main Types of Reflecting Telescopes: A. Newtonian 1. The original reflecting telescope. Made by Isaac Newton 2. Simple. Commonly used in smaller amateur telescopes. B. Cassegrain 1. More compact. 2. Commonly used for the larger telescopes IV. Two Main Types of Reflecting Telescopes: A. Newtonian 1. The original reflecting telescope. Made by Isaac Newton 2. Simple. Commonly used in smaller amateur telescopes. Newton polished his mirror from a solid piece of metal. B. Cassegrain 1. More compact. 2. Commonly used for the larger telescopes V. Why Do Astronomers Want to Build Larger and Larger Telescopes? A. The larger the primary mirror of a telescope, the more _______ it can collect. This means it can see ____________ objects and take images in a ___________ period of time. B. The larger the primary mirror, the better the ___________. Larger telescopes can see more detail. 1.22 l D θ = angular separation (in radians) l = wavelength of light being collected D = diameter of the primary mirror or lens V. Why Do Astronomers Want to Build Larger and Larger Telescopes? A. The larger the primary mirror of a telescope, the more __light__ it can collect. This means it can see ____fainter___ objects and take images in a ___shorter___ period of time. B. The larger the primary mirror, the better the ___________. Larger telescopes can see more detail. 1.22 l D θ = angular separation (in radians) l = wavelength of light being collected D = diameter of the primary mirror or lens V. Why Do Astronomers Want to Build Larger and Larger Telescopes? A. The larger the primary mirror of a telescope, the more __light__ it can collect. This means it can see ____fainter___ objects and take images in a ___shorter___ period of time. B. The larger the primary mirror, the better the __resolution__. Larger telescopes can see more detail. 1.22 l D θ = angular separation (in radians) l = wavelength of light being collected D = diameter of the primary mirror or lens V. Why Do Astronomers Want to Build Larger and Larger Telescopes? A. The larger the primary mirror of a telescope, the more __light__ it can collect. This means it can see ____fainter___ objects and take images in a ___shorter___ period of time. B. The larger the primary mirror, the better the __resolution__. Larger telescopes can see more detail. 1.22 l D the smaller the better θ = angular separation (in radians) l = wavelength of light being collected D = diameter of the primary mirror or lens the bigger the better VI. Preferred Location of Telescopes A. The turbulence of the atmosphere causes the light passing through it to be ____________. We see this as twinkling of the stars. Astronomers see this as a problem that prevents them from obtaining nice clear images. B. As a result, most major observatories are place on the top of _____________ to get above as much of the Earth’s atmosphere as possible. C. Even on the tops of mountains, there is distortion from the Earth’s atmosphere, plus the Earth’s atmosphere absorbs many wavelengths of light. The ultimate, distortion-free environment is to observe from ______________. The primary drawback of observing from space is the expense. VI. Preferred Location of Telescopes A. The turbulence of the atmosphere causes the light passing through it to be __refracted__. We see this as twinkling of the stars. Astronomers see this as a problem that prevents them from obtaining nice clear images. B. As a result, most major observatories are place on the top of _____________ to get above as much of the Earth’s atmosphere as possible. C. Even on the tops of mountains, there is distortion from the Earth’s atmosphere, plus the Earth’s atmosphere absorbs many wavelengths of light. The ultimate, distortion-free environment is to observe from ______________. The primary drawback of observing from space is the expense. VI. Preferred Location of Telescopes A. The turbulence of the atmosphere causes the light passing through it to be __refracted__. We see this as twinkling of the stars. Astronomers see this as a problem that prevents them from obtaining nice clear images. B. As a result, most major observatories are place on the top of ___mountains___ to get above as much of the Earth’s atmosphere as possible. The Keck telescope on Mauna Kea in Hawaii sit at 13,600 ft … above 40% of the atmosphere. * C. Even on the tops of mountains, there is distortion from the Earth’s atmosphere, plus the Earth’s atmosphere absorbs many wavelengths of light. The ultimate, distortion-free environment is to observe from ______________. The primary drawback of observing from space is the expense. Keck Telescopes on Mauna Kea, Hawaii Kitt Peak National Observatory, Arizona La Silla Paranal Observatory in Chile VI. Preferred Location of Telescopes A. The turbulence of the atmosphere causes the light passing through it to be __refracted__. We see this as twinkling of the stars. Astronomers see this as a problem that prevents them from obtaining nice clear images. B. As a result, most major observatories are place on the top of ___mountains___ to get above as much of the Earth’s atmosphere as possible. The Keck telescope on Mauna Kea in Hawaii sit at 13,600 ft … above 40% of the atmosphere. C. Even on the tops of mountains, there is distortion from the Earth’s atmosphere, plus the Earth’s atmosphere absorbs many wavelengths of light. The ultimate, distortion-free environment is to observe from _________. The primary drawback of observing from space is the expense. VI. Preferred Location of Telescopes A. The turbulence of the atmosphere causes the light passing through it to be __refracted__. We see this as twinkling of the stars. Astronomers see this as a problem that prevents them from obtaining nice clear images. B. As a result, most major observatories are place on the top of ___mountains___ to get above as much of the Earth’s atmosphere as possible. The Keck telescope on Mauna Kea in Hawaii sit at 13,600 ft … above 40% of the atmosphere. C. Even on the tops of mountains, there is distortion from the Earth’s atmosphere, plus the Earth’s atmosphere absorbs many wavelengths of light. The ultimate, distortion-free environment is to observe from __space__*. The primary drawback of observing from space is the expense. Hubble Space Telescope VII. Adaptive Optics A. This is a method to compensate for the atmosphere’s turbulence that is _______________ than sending the telescope into space. B. A fairly bright star is monitored. As this bright star moves around due to the turbulence, a deformable secondary mirror makes ___________ of adjustments ____________to correct the image. VII. Adaptive Optics A. This is a method to compensate for the atmosphere’s turbulence that is __less expensive__ than sending the telescope into space. B. A fairly bright star is monitored. As this bright star moves around due to the turbulence, a deformable secondary mirror makes ___________ of adjustments ____________to correct the image. VII. Adaptive Optics A. This is a method to compensate for the atmosphere’s turbulence that is __less expensive__ than sending the telescope into space. B. A fairly bright star is monitored. As this bright star moves around due to the turbulence, a deformable secondary mirror makes __hundreds__ of adjustments __per second__to correct the image. VII. Adaptive Optics A. This is a method to compensate for the atmosphere’s turbulence that is _______________ than sending the telescope into space. B. A fairly bright star is monitored. As this bright star moves around due to the turbulence, a deformable secondary mirror makes __________ _________ adjustments to correct the image. VII. Adaptive Optics A. This is a method to compensate for the atmosphere’s turbulence that is __less expensive__ than sending the telescope into space. B. A fairly bright star is monitored. As this bright star moves around due to the turbulence, a deformable secondary mirror makes __________ _________ adjustments to correct the image. VII. Adaptive Optics A. This is a method to compensate for the atmosphere’s turbulence that is __less expensive__ than sending the telescope into space. atmosphere telescope B. A fairly bright star is monitored. As this bright star moves around due to the turbulence, a deformable secondary mirror makes _rapid and ongoing ___ adjustments to correct the image. CCD (charge coupled device) Viewing Uranus With and Without Adaptive Optics Off On