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Wavelengths of the great lick refractor viewing the universe

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This free course, Telescopes and spectrographs, looks at how they are designed to improve our ability to observe the universe. You will examine how different technologies have been developed over the last four hundred years to enable us to look deep into space. You can start this course right now without signing-up. Click on any of the course content sections below to start at any point in this course. If you want to be able to track your progress, earn a free Statement of Participation, and access all course quizzes and activities, sign-up.
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History of the Telescope

Wavelengths of the great lick refractor viewing the universe
Wavelengths of the great lick refractor viewing the universe
Wavelengths of the great lick refractor viewing the universe
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Telescope Essay

JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. Observatories are home to some of the biggest and most impressive telescopes in the world. As many amateur astronomers know, there are many ways to experience the night sky beyond looking through a telescope in your own backyard. California has an impressive number of observatories that offer a wide variety of star parties, tours and observatory programs that will expand your knowledge of astronomy as well as your love of the night sky, whether you are new to astronomy or have been in the hobby for years.
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[3.0] Giant Telescopes & New Technologies

Located in the thin, stable, and dark atmosphere meters above sea level on Hawaii's dormant shield volcano Mauna Kea, each one provides a light-collecting area ten meters in diameter — double the aperture of the Hale Telescope atop Mount Palomar, four times its light collecting area, and more than ten times the aperture of the James Lick Telescope both of which are still operating today. Throughout history, new technologies have been required to sustain the growth of telescope aperture the most significant measure of light-gathering ability. Lick's inch lens was about the largest, heaviest solid glass body that could be supported by its edge in a telescope. Telescopes much larger than that would have to use curved mirrors instead of lenses. Mirrors can be supported from behind, and they do not absorb any wavelengths of light, or cause chromatic errors, the way lenses do.
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The Believing Brain is bestselling author Michael Shermer's comprehensive and provocative theory on how beliefs are born, formed, reinforced, challenged, changed, and extinguished. In this work synthesizing thirty years of research, psychologist, historian of science, and the world's best-known skeptic Michael Shermer upends the traditional thinking about how humans form beliefs about the world. Simply put, beliefs come first and explanations for beliefs follow. The brain, Shermer argues, is a belief engine.
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