• HOMEWORK #3 due next lecture!
• Midterm next thursday!
• Looking for:
• Jisoo Chung

• Surface features
• Exploration
• Internal Structure
• Tides
• Formation Theories
• Moon History

• Light areas
• heavily cratered
• highlands
• more than 4 billion years old
• Dark areas
• Maria (seas)
• fewer craters
• about 3.5 billion years old
• water cannot exist on the surface of the moon
• Cooperative learning experiment:
• 150 visible meteor craters on the earth
• 1000s on the moon
• assume constant bombardment by meteors
• List the surfaces in order of age

• Soviet
• 1959--1976 unmanned probes (Luna series)
• took picures, orbited, landed and returned
• US
• Early 1960s--1972
• Rangers crashed into moon
• Lunar obiters mapped surface
• Surveyors landed
• Apollo manned visits and return (1969-1972)

• Measured using seismometers
• Possible iron core
• Plastic asthenosphere (analog outer mantle)
• Solid lithosphere (analog continental plates)
• crust

• For of gravity depends on distance

• One side of the earth feels moon's pull more than other side
• Loose things move
• Sun helps too
• Cooperative Learning Experiment:
• What phase(s) of the moon cause the biggest tides?
• Moon feels tides too
• more moonquakes when earth tides are biggest (what phase(s)?)

• Fission
• moon spun off of protoearth
• moon popped out of pacific ocean
• Capture
• moon formed separately, wandered near
• Co-creation
• planetessimal blobs started rotating around each other, each got bigger
• Collision Ejection

• Regardless of formation theory
• Measured cratering rate
• Look at craters, craters in craters, craters in craters in craters....
• Maria formed when lava leaked into BIG craters
• the moon bled!

Mare Basalt (lava rock)

Highland rock (4.1 billion years old)

 

• Surface features
• Moon's surface is very old compared to Earth's
• Cratered highlands older than Maria
• Exploration
• Apollo, Luna
• Internal Structure
• Moonquakes but no plate tectonics
• Tides
• High tide every 12 hours
• Formation Theories
• Collisional Ejection
• Moon History
• Maria are lava-filled craters

• Home of all living creatures on Earth
• 3 km deep in crust
• 10 km high in troposphere
• Living creature's outputs have impact on atmosphere
• Plants create oxygen :-)
• CFCs deplete ozone :-(
• Industrial processes create Carbon dioxide (CO₂)
• The greenhouse effect: Carbon dioxide (CO₂) helps trap heat by transmitting UV, reflecting IR
• CO₂ content increasing since 1958.  What did it do before then?
• Global warming?
• These effects may not be "real."  Do you want to take the chance?

• Home of all living creatures on Earth
• 3 km deep in crust
• 10 km high in troposphere
• Living creature's outputs have impact on atmosphere
• Plants create oxygen :-)
• CFCs deplete ozone :-(
• Industrial processes create Carbon dioxide (CO₂)
• The greenhouse effect: Carbon dioxide (CO₂) helps trap heat by transmitting UV, reflecting IR
• CO₂ content increasing since 1958.  What did it do before then?
• Global warming?
• These effects may not be "real."  Do you want to take the chance?