lecture02

Lecture02 - Astronomy 3 The Nature of the Universe Professor Alice Shapley Lecture 2 Discovering the Universe for Yourself(NGC 1499 Image credit

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Unformatted text preview: Astronomy 3: The Nature of the Universe Professor Alice Shapley Lecture 2: Discovering the Universe for Yourself (NGC 1499 Image credit: Markus Noller, Deep Sky Images) Logistics • Attend lab this week (Knudsen 1116)! • Packet of Lab manuals. • Textbook: The Cosmic Perspective, 6 th edition. Logistics • Head TA: Nassim Bozorgnia – 1-339 PAB – [email protected] Logistics • TA: Cory Jones – 1-704A PAB – [email protected] – Office Hours: Friday 9 am -12 pm • TA: Pooya Monajemi – 54-147B Engineering IV – [email protected] – Office Hours: Monday 12-1 pm, Thursday 1-2 pm Logistics • TA: Thomas Rehagen – 3-540 PAB – [email protected] – Office Hours: Wednesday 11 am - 1 pm, Logistics • Course website: http://www.astro.ucla.edu/~aes/AST3 • CCLE website: https://ccle.ucla.edu/course/view/11S-ASTR3-2 • Lecture notes will be posted to CCLE website. Lecture notes will appear following lecture time. Syllabus posted on course website. Other resources. Logistics • Concept test card sheet. • Print from course website. Always bring to lecture. Course Overview • What is our place in the vast Universe, over a huge range in scales? • What is known about planets, stars, galaxies, and the universe as a whole? • How have we assembled this knowledge using the scientific method ? The Night Sky • … a region of the sky, within official borders set in 1928 by the IAU. • Recognizable by a pattern or group of stars. • Some patterns, like the Winter Triangle of Sirius, Procyon and Betelgeuse, span several constellations. • Most official names of the 88 constellations come from antiquity. Some southern hemisphere constellations were named by European explorers in the 17 th & 18 th centuries. • The patterns of stars have no physical significance! Stars that appear close together may lie at very different distances. • Modern astronomers use constellations as useful general landmarks, but specify the exact location of objects by a system of celestial coordinates . Not to scale • The sky above looks like a dome…a hemisphere.. • If we imagine the sky around the entire Earth, we have the celestial sphere . • This a 2-dimensional representation of the sky; there is no physical sphere up there! Because it represents our view from Earth, we place Earth in the center of this sphere. North & South celestial poles the points in the sky directly above Earth’s north and south poles celestial equator the extension of Earth’s equator onto the celestial sphere ecliptic the annual path of the Sun through the celestial sphere, which is just a projection of Earth’s orbital plane on the sky. (Remember, Earth goes around the Sun!) You’ve probably seen this band of light across the sky from a dark site....
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This note was uploaded on 10/28/2011 for the course ASTR 3 taught by Professor Hauser during the Spring '07 term at UCLA.

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Lecture02 - Astronomy 3 The Nature of the Universe Professor Alice Shapley Lecture 2 Discovering the Universe for Yourself(NGC 1499 Image credit

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