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Our Place in the UniverseDrew Smith
Important Principles
•The Cosmological Principle▫The universe is isotropic and
homogenous (it “looks” the same in all directions.)
•The Copernican Principle▫Humans are not special observers of
the universe. No place was the “starting point” of the universe.
What is the Universe?•The observable universe contains
nearly a septillion stars (1 X 1024). ▫This is more than the number of
grains of sand on earth.•These stars are located in at least 80
billion galaxies.▫These galaxies are then clustered,
and superclustered.
Where do we fit? Solar System
Where do we fit? Interstellar Neighborhood
Where do we fit? Milky Way Galaxy
Where do we fit? Local Group
Where do we fit? Supercluster
Where do we fit? Local Clusters
Where do we fit? Observable Universe
The Universe is EXPANDING• Each object increased in
distance by double, which means the rate of expansion is constant across the universe. However, the object that began 10 cm away travelled 10 cm in the same time that the closer object travelled 5 cm. It was twice as far away, so its recession velocity was twice as great.
Any Questions?•Assignment:
▫Write a story about the origin of earth, the solar system, the galaxy, the universe, or all of the above.
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