Our Galaxy

Write you address: 16825 Spring Cypress Road Cypress TX, 77429 United States of America Earth, Solar System 2/3 Orion-Cygnus Arm Milky Way, Local Group Virgo Super Cluster Universe

How old is the Milky Way?

Approximately 13.2 Billion years old

Easily seen in Rural areas when the Moon is below the horizon.

THEORIES: ORIGIN OF THE UNIVERSE

Where are you from?

Religion teaches men how to go to heaven, not how the heavens

go. ~Galileo Galilee

1630

Steady State Theory

Steady State Theory

Universe appears the same throughout all of time.

No end or beginning. New matter is created to fill in the

voids created by expansion.

Pulsating Theory

Pulsating Theory

Universe oscillates between expanding and contracting.

Big bangs and big crunches occur repeatedly with this model.

Big Bang Theory

Big Bang Theory Georges Lemaitre (1894-

1966) Catholic priest in Vatican

Observatory Independently derived

Friedman’s equation (that describes the universe) and used Einstein's work to show the universe expanded from a single point with primeval atoms in 1927.

Evidence: Olber’s Paradox

Evidence: Olber’s Paradox

Heinrich E. M. Olbers 1758-1840 1826: States that the darkness of the

night sky conflicts with the supposition of an infinite and eternal static universe.

Evidence: Hubble’s Law

In 1929, Edwin Hubble described how galaxies are receding in every direction at velocities proportional to their distance from Earth and each other.

In other words: The universe is expanding

Hubble’s law: Doppler effect

Evidence: Hubble’s law

Evidence: Hubble’s law

Evidence: Hubble’s Law

Using distance and velocity measurements, we can cacluate how old the universe is. T= d/v

4.4x1017 seconds

Calculate how old the universe is!

Evidence: Hubble’s Law

4.14x1017 seconds =

approximately 14.6 Billion years

Evidence: Nucleosynthesis

Creation of new atomic nuclei from pre existing protons and neutrons

Evidence: CMBR Cosmic Microwave Background

Radiation Thermal radiation filling the observable

universe almost uniformly. Detected with sensitive radio telescopes. Discovered in 1964 by American radio

astronomers Arno Penzias and Robert Wilson.