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Bit of Administration ….

Bit of Administration …. Washburn Observatory Wednesday, after dusk for a few hours Reading Chapter 24, Chapter 14 recommended Discussion Section Web-lecture in advance of section 2 pts extra credit for evaluation 3 pt extra credit quiz responsible for material.

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Bit of Administration ….

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  1. Bit of Administration …. • Washburn Observatory • Wednesday, after dusk for a few hours • Reading • Chapter 24, Chapter 14 recommended • Discussion Section • Web-lecture in advance of section • 2 pts extra credit for evaluation • 3 pt extra credit quiz • responsible for material

  2. THE EXTRA-SOLAR PLANET PROJECT • Phase 1: Last week’s quiz. • Phase 2 : A Web-Lecture on Extra-Solar Planets. • Learn about extra-solar planets and have opportunity to earn 5 pts extra credit. • 2 pts for evaluation questions • 3 pts for success on quiz • Preparation for next week’s discussion sections (5/3-5/7). • Access: http://eteach.engr.wisc.edu/meibom/espp/index.html • Speed: 300 Kbps, 100 Kbps, and 37 Kbps. • The hardware requirements for viewing the lecture are: • A computer with connection to the Internet. • Computer speakers or headphones. • The software requirements for viewing the lecture are: • Windows Operating System. • Internet Explorer version 5.5 or later. • Power Point 2002 or later ("Power Point Animation plug-in"). • Campus computer-labs: • http://www.doit.wisc.edu/computerlabs/index.asp • Bring headphones!

  3. Asteroids, Comets, Meteors, and Pluto

  4. Sedna Oort Cloud Primordial Icy Planetesimals Rocky Planetesimals Jupiter Forms Icy Planetesimals Kuiper Belt Fragmented Icy Planetesimals (KBOs)

  5. Asteroids, Comets, Meteors, and Pluto • Summary • Asteroids • Rocky Planetesimals • Comets • Long - Period = Icy Planetesimals • Short - Period = Fragmented KBOs • Pluto, Sedna, Triton, Kuiper Belt Objects • Icy Planetesimals • Meteors • Processed Iron and Stony Meteorites • Fragmented asteroids • Meteor Showers • Fragmented comets • Primitive Meteors = Rocky Planetesimals

  6. Asteroids, Comets, Meteors, and Pluto

  7. Earth orbit Past Comet Asteroids, Comets, Meteors, and Pluto • Meteors • Showers - debris of old comets

  8. Asteroids, Comets, Meteors, and Pluto • Meteors • Types - Processed Meteorites • Stony Meteorites • 93% • Just like crust of Earth • Iron Meteorites • 6 % • Crystallization patterns => long cooling times

  9. Asteroids, Comets, Meteors, and Pluto • Meteors • Types - Primitive Meteorites • Stony, with trace of pure metallic flakes • Carbonaceous chondrites • Carbon compounds, and even water

  10. Life in the Solar System • Arguments for Life as High Probability • Organic molecules form easily • Carbonaceous Chondrites • Allende Meteorite 2/8/69, 1:05 AM Chondrules (Amino Acids) Calcium-Aluminum Inclusions (CAIs)

  11. Life in the Solar System • Arguments for Life • Organic molecules form easily

  12. Life in the Solar System • Arguments for Life as High Probability • Organic molecules form easily • Life occurred quickly on Earth - < 3.85 billion years 3.5 billion yr old Stromatolites (cyanobacteria)

  13. Life in the Solar System • Arguments for Life as High Probability • Organic molecules form easily • Life occurred quickly on Earth - < 3.85 billion years 4.4 billion yr old zircon high oxygen isotope ratios cool water on Earth!

  14. Life in the Solar System • Arguments for Life as High Probability • Organic molecules form easily • Life occurred quickly on Earth - < 3.85 billion years • Life can exist in a wide range of conditions

  15. Life in the Solar System • Life on Mars ? • Flowing water and warm conditions for ≈ 1 byr • Extensive volcanos • Martian meteorites • ALH84001 magnetite crystals

  16. Life in the Solar System • Life on Mars ? • Flowing water and warm conditions for ≈ 1 byr • Extensive volcanos • Martian meteorites

  17. Life in the Solar System • Life on Europa ? • Icy crust • Tidal heating Liquid oceans Volcanic vents

  18. Life in the Solar System • Life on Europa • Icy crust • Tidal heating Liquid oceans Volcanic vents

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