Lecture28

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

THE EXTRA-SOLAR PLANET PROJECT : 

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!

Asteroids, Comets, Meteors, and Pluto: 

Asteroids, Comets, Meteors, and Pluto

Slide5: 

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

Asteroids, Comets, Meteors, and Pluto: 

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

Asteroids, Comets, Meteors, and Pluto: 

Asteroids, Comets, Meteors, and Pluto

Asteroids, Comets, Meteors, and Pluto: 

Asteroids, Comets, Meteors, and Pluto Meteors Showers - debris of old comets

Asteroids, Comets, Meteors, and Pluto: 

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

Asteroids, Comets, Meteors, and Pluto: 

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

Life in the Solar System: 

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 Calcium-Aluminum Inclusions (CAIs) Chondrules (Amino Acids)

Life in the Solar System: 

Life in the Solar System Arguments for Life Organic molecules form easily

Life in the Solar System: 

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)

Life in the Solar System: 

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!

Life in the Solar System: 

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

Life in the Solar System: 

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

Life in the Solar System: 

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

Life in the Solar System: 

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

Life in the Solar System: 

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