Stephen Hawking's Universe
What five stars did the Greeks observe
-Mercury -Venus -Mars -Jupiter -Saturn
Three pieces of evidence that suggest the earth is not flat
-Two sticks have different shadows when the sun is above them -Lunar eclipses are possible -boats appear to sink when they go into the horizon
Why is "eternal truth" powerful
-scientists must be open minded -all theories must be challenged
Problems with Ptolmey's model of the universe
1. observed planets did not fit into configurations closely enough for this theory to be convincing 2. For the moon path to fit, it had to be twice as close at some points
Copernicus lived in what century
16th
What is the title of Stephen Hawking's book
A Brief History of Time
Did Kepler support the Ptolemaic or Copernican model?
Copernican
Who wrote this book
David Filkin
How did Kepler tweak the Copernican model?
He thought that there was a magnetic force holding one body in place while the others rotated eliptically
What was Tycho Brahe's role?
He was given an island and instruments to observe and model the heavans
What's the quote you have to memorize
Science cannot promise eternal truths. Only the elimination of false hypothesis and the establishment of what is currently the most likely explanation of an aspect in reality.
Ptolmey's model of the universe
The earth was in the center and the planet revolved around the earth in epicycles. This explains why they double back and grow brighter/dimmer
What is a wandering star
a planet
What does geocentric mean
earth centered universe
What makes a statement scientific
has measurements
What does Stephen Hawking have to do with the book
he was a science consultant
Copernicus model of the universe was?
heliocentric but against the church
Scientific method
hypothesis experiment data analysis conclusion
Give an example of a scientific model
ptolmey's model of the universe
Ptolmey lived in what century
second century ad
Heliocentric means?
sun centered
What do cosmologists study
the universe of a whole
What are competing models
two models about the same thing but provide conflicting explanations and can't disprove each other
Retrograde motion
when the planets appear to double back on themselves
