1.20 Astro 1

1.20 Astro 1 - Astro 1 Section 1 Professor Brandt Wednesday...

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Astro 1 Section 1 Professor Brandt Wednesday January 20th 1999 Announcements: Lecture notes: Class 5. Constellations 12000 years from now Vega will be the North Star Vega is a very bright star near the horizon at twilight. It's in the constellation Lyra (Lyre) Also Cygnus = swan it's right above Lyra First good black hole was discovered in this constellation cygx-1 Main topic for today's lecture is to discuss "Why the Earth orbits the Sun" The answer to this question took many years to discover. The Greeks started to answer this around 350 BC and there wasn't really as satisfactory answer until about 1666 took over 2000 years to solve this problem! people didn't know for most of human history. One way to get insight into this problem is to do a short experiment. Like a ball swung on a string if the string is cut the ball flies off. The same thing must hold for the orbit of the Earth. There needs to be a force to keep the Earth from flying off into space. Gravity
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1.20 Astro 1 - Astro 1 Section 1 Professor Brandt Wednesday...

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