10 - Galileo Challenges the Geocentric Model-Heliocentric...

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- Copernicus died before the full effects of his model were felt - However, other astronomers advanced his model, using their observations . Galileo - Galileo Galilei (1564-1642) was an Italian scientist who studied many fields. - He is said to have dropped cannonballs from the leaning tower of pisa - He obtained the first observation to confirm the heliocentric model. More evidence for the Copernican Model - Galileo was the first person to use a telescope for astronomy. - Several of his observation supported the Heliocentric model of Copernicus. - He discovered moons orbiting Jupiter (not the Earth) Galileo Galilei - Galileo observed Venus with his telescope - He reported seeing crescent and gibbous phased on Venus . - Gibbous phases are only possible if Venus is on the other side of the sun from us. - This can’t happen in the geocentric (<Earth at Center) model of the universe!
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Unformatted text preview: Galileo Challenges the Geocentric Model-Heliocentric model challenged beliefs held for 2000 years.-The Church felt threatened by this. -Galileo was arrested and Tried (trialed). -He was not allowed to advocate the Heliocentric Model.-He had reason to fear: Giordano Bruno, another advocate of the Heliocentric Model, was tried by the Inquisition.-Bruno was burned at the stake for heresy!-However word of Galileos discoveries spread Two Theories of the Solar System-Ptolemy (1 st century AD) proposed a geocentric theory-His theory could explain the retrograde motion of planets, and was not challenged for over 1000 years.-Copernicus (1500s) suggested a heliocentric theory:-Planets orbited the sun, not the earth, in circles....
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10 - Galileo Challenges the Geocentric Model-Heliocentric...

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