24
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.
