The Athropic Principle

1
The Athropic Principle

• Science has discovered many factors that are
  necessary conditions to sustain life. The chance
  that all these factors happen by itself is
  extremely unlikely. In fact, they are so unlikely
  that science coined a new term to describe them
  athropic principle.

2
Where are we exactly ?
Earth
Galaxy
Solar System
Universe
3
Is our earth and solar system special ?

• There are millions of galaxies
• Within one galaxy, there are millions of stars
• Surely, there must be billions of planets just
  like our earth ?
• And there must be millions of planets that have
  life on them !
• That was science believed
• Recently, science discovered many factors that
  are necessary to make life possible
• Our earth and solar system is in fact, special !

4
Conditions for Life

• Life is extremely fragile
• Life need water
• Life need sun light (photosynthesis)
• Life cannot tolerate high energy radiation
  (X-rays, Gamma-radiation)
• Life cannot tolerate extreme heat (ever seen a
  fish swim in boiling water ?)
• Life cannot tolerate extreme cold (ever seen a
  fish survive in ice ?)
• And so on

5
Life Shape of the Galaxy

• Galaxies come in 3 shapes

Spiral galaxy
Elliptical galaxy
Irregular galaxy