3.22 Astro 1 Section 1 Professor Brandt

3.22 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Monday March 22nd 1999 Announcements: Lecture notes: Class 28. "Optical telescopes - Penn State is building a giant optical telescope" Starting a new section of the course. Telescopes and cosmology. For next 2 lectures we'll discuss telescopes and then will start on cosmology. Telescopes. So the main way that astronomers learn about the Universe is by observing electromagnetic radiation with telescopes. Since astronomers cannot experiment with celestial sources but only observe electromagnetic radiation from them they constantly strive to improve their telescopes. Another important point is that when we speak of a telescope it won't always mean an optical (visible light) telescope. Huge range of electromagnetic radiation requires many different telescopes to study universe effectively. e.g. radio - radio dishes X-ray - "Geiger counters" on satellites because of atmosphere. However visible light telescopes have been very important historically and today I'll focus on them.
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