ASTRONOMY 161 Introduction to Solar System Astronomy.

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Presentation transcript:

ASTRONOMY 161 Introduction to Solar System Astronomy

Astronomy 161 ( ) Winter Quarter 2007 MWF 10:00-11:18 am Professor: D. L. DePoy Office: 4059 McPherson Lab Office hours: MTWTh 8-10am T 2-5pm Th 2-3pm

TA: K. Schlesinger Office: 4020 McPherson Lab Office hours: pending Text: Universe (7 th Edition) by Freedman and Kaufman In-class Exams: Jan 19, Feb 9, Mar 2 Final: March 13, 9:30 a.m. Grade: 75% In-class Exams, 25% Final

Astronomy 161: The Web Page The Web page for course contains the syllabus, lecture notes (as the course progresses), and other information, including links to various WWW sites related to astronomy.

What is astronomy? “astron” = star “nomos” = law Astronomy is the science of stars and clusters of stars, galaxies and clusters of galaxies, planets, “dwarf planets” and their satellites, asteroids and comets, interstellar gas and dust (and anything else in the Universe).

Star: The Sun 150 million kilometers away 1.4 million kilometers across

Cluster of Stars: The Pleiades 430 light-years away 15 light-years across

Galaxy: The Andromeda Galaxy 2,200,200 light-years away 80,000 light-years across

Cluster of Galaxies: The Coma 320 million light-years away 10 million light-years across

Gas & Dust: The Lagoon Nebula 5000 light-years away 50 light-years across

Solar System Eris=

Planet: The Earth 13,000 kilometers across

Dwarf Planet: Pluto 2,300 kilometers across

Satellite: The Moon 380,000 kilometers away 3,500 kilometers across

Asteroid: Eros 33 kilometers long

Comet: Comet Hale-Bopp nucleus: 10 kilometers across tail: 100 million kilometers long

What is Science? The SYSTEMATIC study of the Universe Gather facts Modify hypothesis Guess an explanation (Guess=hypothesis) Test hypothesis

MAIN QUESTIONS 1) What have astronomers learned? 2) HOW HAVE THEY LEARNED IT?

Practical matters: Astronomers use powers-of-ten notation to write LARGE and SMALL numbers. (Section 1-6 of textbook)

Astronomers measure length in meters, astronomical units, & light-years

Astronomers measure time in seconds & years

Astronomers measure mass in kilograms Note: mass and weight are NOT the same thing. MASS = amount of matter. WEIGHT = force with which gravity tugs on matter. Mass = 1 kilogram Weight = 35 ounces on Earth; 6 ounces on Moon; 13 ounces on Mars.