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Kepler's laws
Galileo Galilei
Astronomy
Geocentric & Heliocentric
Retrograde
100
the path of each planet around the sun is an ellipse with the sun at one focus, the other focus is symmetrically located at the end of the ellipse.
summerize Kepler's first law
100
it is the force of gravity.
What is weight?
100
the science that studies the universe
What is astronomy?
100
Mercury,Venus, Mars and Jupiter orbit earth. Aristole & Ptolemy believed this model.
What is a geocentric model?
100
westward motion.
explain retrograde motion
200
each planet revolves so that an imaginary line connecting it to the sun sweeps over equal areas in time.
summarize Kepler's second law
200
He was the first scientist to use a telescope to view the night sky.
What is one very important fact about Galileo?
200
the milky way.
What is the name of our galaxy?
200
Earth and the other planets orbit the sun. Aristarchus & Copernicus believed in this model.
What is a heliocentric model?
200
Nicolaus Copernicus: 1473-1543
who was the first person to conclude that earth was a planet?
300
the square of the length of time it takes a planet to orbit the sun. (P2=A3)
Summarize Kepler's third law.
300
a telescope magnify's objects closely.
What does a telescope do?
300
Greece. Developed the basics of geometry and trigonometry.
where was the "golden age" of astronomy centered?
300
Geocentric. Predicted the motion of the planets.
did Ptolemy believe in a heliocentric or geocentric model?
300
Earth moves faster than Mars, its closer to the sun than Mars.
Why does retrograde between Earth and Mars occur?
400
(P2=A3) P=orbital period (years) A=A.U (distance from the sun)
What is the formula for Kepler's third law?
400
geocentric
did Galileo's research support a geocentric or heliocentric model?
400
Erthosthenes. 276-194 B.C
Who was the first to successfully establish the size of the earth?
400
heliocentric. Copernicus used circles to represent the orbits of the planets.
did Copernicus believe in a geocentric or heliocentric model?
400
yes.The sun is our center of the solar system, its able to account for the planets moon.
Was Ptolemy incorrect? why or why not?
500
its not a perfect circle. Ellipse
What did Kepler discover about Mars' orbit?
500
1. four satellites moons, orbiting Jupiter. 2. the discovery that the planets are circular disks. 3. the discovery that Venus has phases just like the moon. 4. the discovery that the moons surface was not smooth 5. the sun had sunspots or dark regions.
List the 5 discoveries of Galileo that supported Copernicus's view of the universe.
500
geometry. s (distance) l (shadow angle) -------------- = ------------------- c (circumference) 360 degrees
What type of math did this Egyptian use to solve his dilemma?
500
a) heliocentric b) used geometry for distance c) calculate the size of the moon
What were three contributions of Aristarchus?
500
a) Mars b) personal observations (he did it for 20 years)
a) Tycho Brahe observed and recorded data on which planet? b) how did he do this?