1. Is the "dark side of the Moon" always in the dark? Why, or why not?
2. What are two observations, possible with the naked eye, which
contradicted the Ptolmeic model? How did they do so?
[a]
[b]
3. The Terrestrial planets in our solar system that have substantial atmospheres are:
4. The more __________ an object is, the further back in time we look when we
observe it. Why?
5. If the radius of the Earth's orbit was decreased to a third of its
current size, then what would happen to parallax angles?
6. Procyon is 11 light-years away, while Hadar is 525 is light-years
away. Which star has the greater parallax angle?
7. Sketch the solar system, under the following conditions. First, draw a
circle to indicate the position of the Sun (placing the letter "S" near to
it). Second, draw four large dashed circles to indicate the orbits of Earth,
Jupiter, Mars, and Venus. Third, place Earth anywhere on its orbital path, by
drawing a small circle with the letter "E" near to it; place Jupiter so it
would appear in the "full" phase from Earth; place Mars where it would rise at
midnight, as viewed from Earth. Fourth, add two circles for Venus, at the
locations where it could most easily be observed from Earth by eye.
8. What phase would Mars appear to have from Earth, in your diagram?
9. What is the maximum separation between Earth and Jupiter, in units of
A.U.? What is the minimum?
Jupiter lies 5.2 A.U. from the Sun.
10. If the planet Neptune has a year 165 Earth years long, at what radius
does it orbit the Sun? Remember that the Earth has an orbital radius of 1
A.U., and takes one Earth year to go once around the Sun.
[a] the Moon and Mercury
[b] Mercury, Venus, and the Earth
[c] Mars, Venus, and the Earth
[d] Mars, Jupiter, and the Earth
[a] bright
[b] faint
[c] nearby
[d] distant
[a] less than one A.U.
[b] one A.U.
[c] more than one A.U.
[d] We need more information to answer this question.