Starter  To date, what do you think the most important discovery/contribution an Astronomer has made to Astronomy?

Table of Contents  9/14/15  Astronomers

Ptolemy  Proposed a Geocentric Universe: the Earth is the center of the Universe; this was also known as the Ptolemy System

Copernicus  Proposed that the Sun was at the center of the universe, remained stationary, and the planets revolved around the Sun: Heliocentric

Tycho Brahe  Made observations that proved the universe was always changing.  Also proposed the Sun and the Moon revolved around the Earth

Kepler  Planets revolve around the Sun in an elliptical path  Came up with 3 laws

Kepler’s 3 Laws

Galileo  The first telescope was built by Dutch eyeglass makers  Improved the telescope

Galileo  Gathered evidence to prove we are a Heliocentric universe  Heavenly bodies revolve around each other.

Newton  Universal Gravitational Law

Hubble  Other galaxies besides the Milky Way  Has a telescope named after him

Cat’s Eye Nebula

Crab Nebula

Maria Mitchell  Discovered a comet that was then named Miss Mitchell’s Comet

Henrietta Swan Leavitt  Her work made it possible for astronomers to determine the distance between a star and the Earth

Vocabulary  Heliocentric  Geocentric  Telescope  Astronomer  Observation

Astronomer: Fakebook  You will work in partners (2 people). You may choose to work by yourself but your due date does not change.  You will choose one astronomer to create a Fakebook profile for. You will choose today and begin research tomorrow on the chromebooks and creating your Fakebook profile.