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When Copernicus first created his Sun-centered
model of the universe, it did not lead to substantially better predictions of
planetary positions than the Ptolemaic model. Why not?
Copernicus used perfect circles for the orbits of the planets
If you could count stars at a rate of about
one per second, how long would it take to count all the stars in the Milky Way
Several thousand years
Suppose we imagine the Sun to be about the
size of a grapefruit. How far away are the nearest stars (the three stars of
What is the ecliptic plane?
The plane of Earth's orbit around the Sun
Which of the following best describes the
Milky Way Galaxy?
a spiral galaxy with a disk about 100,000 light-years in diameter and containing between 100 billion and 1 trillion stars
Which of the following claims can be tested by
People born when the Sun is in the constellation of Leo are more financially successful than other people.
Using the ideas discussed in your textbook, in
what sense are we "star stuff"?
Nearly every atom from which we are made was once inside of a star.
An astronomical unit is:
Earth's average distance from the Sun.