L1 Flashcards
(24 cards)
What is a model?
a representation, generally in mini form, to show to construction or appearance of something
What is hte geocentric model?
a model of the universe in which Earth is at the center of the revolving planets and stars
What is the order of the planets in the geocentric model?
Moon Mercury Venus Sun Mars Jupiter Saturn
Name two proponents of the geocentric theory
Hipparchus
Ptolemy
T/F Ptolemy was a Greek astronomer
true
Who was noted for improving the geocentric theory
Ptolemy
What did Ptolemy believe about the universe
A) earth was at the center of the universe
b) planets moved in smaller circles carried along by bigger circles
What problems did people have with the geocentric theory?
- it was inaccurate from what they observed
but explanations used to explain the inaccuracies were complicated, so the geocentric theory was accepted for more than 1500 years
What is the heliocentric model?
a model of the solar system in which earth and the other planets revolve around to sun
What is the planet order of the heliocentric model?
Mercury Venus earth mars Jupiter Saturn Uranus Neptune
Name four major contributors to the heliocentric theory
- Nicolaus Copernicus
- Tycho Brahe
- Johannes Kepler
- Galileo Galilei
Who seriously questioned the accuracy of the geocentric theory?
Nicolaus Copernicus
Who correctly place the sun at the center of the planets?
Nicolaus Copernicus
What did Nicolaus Copernicus assume INCORRECTLY?
that the planets travel in orbits that are in perfect circles
T/F Tycho Brahe Worked alone
FALSE…he had assistants
What did Tycho Brahe do with his team?
they carefully observed and recored the positions of the planets
how long did Tycho Brahe study the sky?
over 20 years
Whose assistant was Johannes Kepler?
Brahe
What job did Kepler have on Brahe’s team?
to analyze the data
What did Kepler focus on while he analyzed data?
Mars’ orbit
what did Kepler determine by studying Mars’ orbit?
that it was an ellipse
What astronomer used a telescope?
Galileo Galilei
Galileo Galilei made discoveries that supported what?
heliocentric theory
what 2 discoveries did Galileo make that supported the heliocentric theory
he discovered 4 moons around jupiter and that Venus goes through phases simialer to the moon
