What discoveries of Galileo helped confirm the views of Copernicus, and how did
they do so?
surface of moon
phases of Venus
-showed Earth was notcenter.
Briefly describe Keplers three laws of planetary motion.
The orbital paths of
PUBLICATIONS OF THE
ASTRONOMICAL SOCIETY OF THE PACIFIC
Vol. XLIV San Francisco. California, April. 1932 No. 258
THE SIZE OF THE UNIVERSE1
BY WILLEM DE SITTER
Before we can discuss the size of the universe it is necessary
to dene e
E D I T E D B Y frank kermode
. .jeremy bxems-tein
NEW YORK I THE "VIKING PRESS Physics Library
Copyright 1973 by Jeremy Bernstein
All rights reserved
First published in 1973 in a hardbound and
paperbound edition by
The Viking Press, Inc
The copyright law of the United States [Title 17, United
States Code] governs the making of photocopies or other
reproductions of copyrighted material.
Under certain conditions specified in the law, libraries and
How did Uranus come to be spinning on its side?
Unlike all other planets:
whose spin axes are roughly perpendicular to the plane of the eclipticUranuss axis of rotation lies almost within that plane
- 98 degrees from the perpendicular.
No one knows why Ur
The upper clouds are made up of sulfuric acid.
Impact bodies on Venus
Because Venuss atmosphere is so thick, small meteoroids do not reach the ground,
so the average crater is no smaller than 2-3 km across.
On Earth, the average meteoroid strike is 10 m a
- Roughly the size of North America, lies on the Martian equator and rises 10 km
higher than the rest of the Martian surface.
Thought of as the only continent on Mars.
It has three very large volcanoes on it.
Chryse Planitia (to the east of
What is parallax?
Give an everyday example.
The apparent displacement of a foreground object relative to the background as
theobservers locations changes.
Closer the object is to observer, greater the parallax.
What two pieces of information are needed to
Why is opposition the best time to see Mars from Earth?
Mars is largest and brightest in the night sky at opposition, when Earth lies
between Mars and the Sun. Mars is closest to Earth during opposition.
Why are some Martian oppositions better than others
Mechanism for helium
Helium precipitation is responsible for depleting the outer layers of their helium
Deficient in Helium
yes the fraction of helium on Saturn is far less than is observed on Jupiter.
Catastrophic event Saturns rings
What would happen to the Earth if the Suns gravity were suddenly turned off?
The earth would continue on in a path tangent to its natural orbit.
Define the following properties: period, wavelength, amplitude, and frequency.
What are comets like when they.
They look like faint, fuzzy patches of light on the sky while they are still several
astronomical units away from the sun.
Travel in a highly elliptical orbit with the sun at one focus.
As it gets closer, the comet brighten
Less Varied Appearance than Jupiter
because Saturn's clouds are thicker:
there are few holes and gaps in the top layer
We rarely glimpse the more colorful levels below. Instead, we see only different levels
in the topmost layer.
Saturn shape, deep interio