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# Astronomy Class Lecture

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This is the second lecture from my Life Beyond Earth class in 2010. Note: the class was 2 hours long.

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• But we’re going to stay local, and with normal matter
• ### Astronomy Class Lecture

1. 1. George Hraband the 365 Days of Astronomy Podcast<br />
2. 2. The Universe (in one lecture)<br />Lecture 2<br />Chapter 3.1, 3.2, 3.4<br />
3. 3. The Size and Scale of Things<br />By morn1415 on YouTube<br />in HD (local file)<br />
4. 4. The Size and Scale of Things<br />Scale Model in Green Bank, WV<br />Voyage Model in DC – Jeffrey Bennett<br />
5. 5. The Size and Scale of Things<br />If the Earth is the size of a ping pong ball, how big is the Sun?<br />CC Watchcaddy on Flickr<br />
6. 6. The Size and Scale of Things<br />If the Earth is the size of a ping pong ball, how big is the Sun?<br />Ping pong = 40 mm diameter<br />Diameter Sun = 109 * Diameter of Earth<br />Analog sun -><br />CC Watchcaddy on Flickr<br />
7. 7. The Size and Scale of Things<br />If the Earth is the size of a ping pong ball, how big is the Sun?<br />Ping pong = 40 mm diameter<br />Diameter Sun = 109 * Diameter of Earth<br />Analog sun -> ~ 14.3 ft diameter<br /> about the size of this room!<br />CC Watchcaddy on Flickr<br />
8. 8. The Size and Scale of Things<br />How far away is the ping pong ball from the room?<br />
9. 9. The Size and Scale of Things<br />How far away is the ping pong ball from the room?<br />Our scale: ~1:160,000,000<br />Distance from Earth to Sun ~ 93 million miles<br />Model distance -><br />
10. 10. The Size and Scale of Things<br />How far away is the ping pong ball from the room?<br />Our scale: ~1:160,000,000<br />Distance from Earth to Sun ~ 93 million miles<br />Model distance -> ~3081 ft, or the distance to the Rotunda<br />
11. 11. The Size and Scale of Things<br />Sun<br />Earth<br />
12. 12. The Size and Scale of Things<br />Sun<br />Earth<br />Mercury<br />Venus<br />Mars<br />
13. 13. The Size and Scale of Things<br />Jupiter<br />Saturn<br />to Mars<br />Uranus<br />Neptune<br />Outer Edge of Kuiper Belt<br />
14. 14. The Size and Scale of Things<br />2:37<br />Sixty Symbols on YouTube<br />Local HD<br />
15. 15. The Size and Scale of Things<br />Now, pretend the Sun is a ping pong ball. Where is the nearest star?<br />MSX/IPAC/NASA<br />
16. 16. The Size and Scale of Things<br />Now, pretend the Sun is a ping pong ball. Where is the nearest star?<br />Alpha Centauri (3 star system) <br /> 4.2 light years or 1.3 parsecs away<br /> 2.5 x 1013 miles (25,000,000,000,000 miles)<br />The ping pong ball would be -><br />MSX/IPAC/NASA<br />
17. 17. The Size and Scale of Things<br />Now, pretend the Sun is a ping pong ball. Where is the nearest star?<br />Alpha Centauri (3 star system) <br /> 4.2 light years or 1.3 parsecs away<br /> 2.5 x 1013 miles (25,000,000,000,000 miles)<br />The ping pong ball would be -> 714 miles away<br />MSX/IPAC/NASA<br />
18. 18. The Size and Scale of Things<br />Ping pong ball<br />Ping pong ball<br />
19. 19. The Size and Scale of Things<br />Those are just two nearby ping pong balls in a group of 100 billion, spanning millions of miles<br />… a galaxy spanning thousands of light years, or hundreds of quadrillions of miles!<br />Nick Risinger<br />
20. 20. HOW do we know?<br />Distance to Venus -> radar<br />The ratios of planetary distances were known, but an accurate measurement to Venus using the speed of light solidified the numbers<br />NASA<br />NASA<br />
21. 21. HOW do we know?<br />Nearby stars measured by parallax<br />CC NoisyAstronomer<br />
22. 22. HOW do we know?<br />More distant objects use indirect methods, building a “distance ladder”<br />Star spectral types<br />Variable stars<br />Supernovae<br />Redshift<br />Ned Wright<br />DOE NNSA ASC/Alliance Flash Center at U of Chicago<br />
23. 23. The Universal Context<br />The Millenium Simulation (http://www.mpa-garching.mpg.de/galform/millennium/)<br />local<br />local better<br />
24. 24. The Universal Context<br />Sloan Digital Sky Survey<br />
25. 25. The Universal Context<br />More Perspective<br />Tree Lobsters are awesome<br />
26. 26. Expansion<br />Elementary, my dear Humason!<br />The further away a galaxy is, the faster it is moving away! Beautifully demonstrated by distant supernovae all the way to large distances measured today.<br />
27. 27. Expansion<br />NASA<br />
28. 28. More Evidence of Expansion<br />WMAP/NASA<br />
29. 29. CMB in Context<br />
30. 30. More Evidence of Expansion<br />http://casa.colorado.edu/~ajsh<br />
31. 31. H, He, Li… boring universe?<br />http://savillbiology.com/Chemistry.html<br />
32. 32. Star Stuff…<br />Csemiseryon Youtube<br />local<br />All of Cosmos is available for free on Hulu. Seriously, watch it: http://www.hulu.com/cosmos<br />
33. 33. Stellar Life Cycle<br />
34. 34. Molecules in Space<br />Orion Nebula, NASA/Herschel<br />
35. 35. Other Solar Systems<br />Beta Pic, ESO<br />
36. 36. Other Solar Systems<br />Fomalhautb, HST/NASA<br />
37. 37. Other Solar Systems<br />There’s an app for that<br />
38. 38. How do we know? <br />Chandra and STSci<br />It’s all about LIGHT.<br />
39. 39. It’s all about LIGHT<br />
40. 40. Temperature and Light<br />Planets and People<br />(300 K)<br />Stars<br />(1000s K)<br />Masgatotkaca (Wikimedia)<br />Hubble, NASA<br />
41. 41. Atoms (and molecules) and Light<br />