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