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ASTR-1010 Planetary Astronomy

ASTR-1010 Planetary Astronomy. Day - 17. Announcements. Smartworks Chapter 6: Due Thursday, Nov. 4 Don’t forget to vote next Tuesday. Spring Classes. Spring 2011: ASTR 1010/1011 – Planetary Astronomy ASTR 1020/1021 – Stellar Astronomy + Honors ASTR 2020 – Problems in Stellar Astronomy

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ASTR-1010 Planetary Astronomy

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  1. ASTR-1010Planetary Astronomy Day - 17

  2. Announcements Smartworks Chapter 6: Due Thursday, Nov. 4 Don’t forget to vote next Tuesday

  3. Spring Classes Spring 2011: ASTR 1010/1011 – Planetary Astronomy ASTR 1020/1021 – Stellar Astronomy + Honors ASTR 2020 – Problems in Stellar Astronomy ASTR 3020 – Cosmology ASTR 3040 – Astrobiology

  4. ClassAction Stuff • Splash page questions

  5. Earth’s Surface

  6. Torino Scale

  7. Cratering Rate NASA/JPL/Caltech

  8. Concept Quiz  Craters and Ages Which of the following statements is false? • Old surfaces accumulate craters by impacts over billions of years. • Accretion would mainly produce craters long ago. Small, airless worlds would retain the craters. • We have direct ages from radioactive decay for cratered and uncratered regions on the Moon. The cratered regions are older.

  9. Other Planetary Systems Recall: • Gravity is a mutual force, so both stars and planets orbit one another. • Motion can be detected by Doppler shifts. Surveys for other planets: • Examine stellar velocities with high precision. • Some stars have periodic velocity changes. • Therefore they are orbited by planets.

  10. Orbits of the Sun and Jupiter

  11. Known Planetary Systems • Many known planets have 1 to 10 times the mass of Jupiter. • By comparison, Earth’s mass = 1/300 Jupiter. • Some of these orbit close to their stars and are called hot Jupiters. • The discovery of Earth-like planets is still years away.

  12. Detecting Planets with Eclipses • A planet can pass in front of its star. • A small amount of the star’s light is blocked. • We see a reduction in the star’s brightness. • The reduction repeats periodically (orbital period of the planet.) • Only some planetary systems could be found this way.

  13. Eclipses and Planets

  14. Concept Quiz  Other Planets We can find planets around other stars because … • The planet’s gravity causes the star to orbit. • We can take images and directly see the planets. • We can detect radio signals from life on the planets.

  15. Exoplanet Stuff • Kepler • Exoplanets Encyclopedia • Exoplanets Links

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