Astro 10-Lecture 15: Astrobiology: Life in the universe
First some biology. What is life, anyway?
Evolution: How life changes over time.
DNA: The genetic code
Mutations: The Good, the Bad and the Indifferent
Selection: The other half of evolution
When did life start on Earth?
Abiogenesis: How did life start on Earth?
Theories of abiogenesis.
Timeline of life on Earth
Chemosynthesis: Energy from chemical reactions used to build sugars
Lessons from the timeline
Life on other planets
Requirements for “earthlike” life.
Life elsewhere in the solar system
Life in other solar systems
The Drake Equation
Author: Eric Korpela
E-mail: korpela at ssl.berkeley.edu
For the educational use of the Vista Astro 10 class only