Life beyond earth

1
Scientific american special edition on the Solar
system
Life beyond earth?
2
(No Transcript)
3
Center of mass
Example Sun and Jupiter Jupiter a7.78 10
km Sun a742,000 km R696,000
km
8
4
Radial velocity
Astrometric method
5
Massive planets, close to the star, elliptical
orbits
6
30 Jupiters (or more)
30 AU
19 ly
7
How many stars in the galaxy?
About 100 billion
Comfortable life?
Astrobiology/exobiology
8
The chemical building blocks of life are found
throughout space
Organic molecules
From the very beginning of the solar system
9
Miller-Urey-type experiment
Not life in a test tube
10
Only Earth in the solar system..
Liquid water?
Mars and Europa
But what if.
Europa ice
11
Mars
Viking1
Beagle2
12
Mars global surveyor


13
Meteorites
ALH84001
14
4.5 billion yr?16 million impact?13,000 antartica
100nm
15
Quiz for next time does oxygen escape from
Earth or not?
Study chapter 7,sections 7,8,9 and chapter 30
Quiz 31
Exercises 22, (ch 7) and 12 (ch 30)