1. Which of the following objects obey Kepler's laws?

a. A comet orbiting the Sun.

b. A planet orbiting the Sun.

c. The moon orbiting the Earth.

d. The space station orbiting the Earth.

e. All of the above.

2. A geostationary satellite orbits the earth in exactly 24hrs so that it is always located above the same spot on the earth. The space station orbits the earth in 90 min. The moon orbits the earth in about 28 days. Given Kepler's laws, rank these objects in terms of distance from Earth, starting with the closest.

a. Moon, space station, geostationary satellite.

b. geostationary satellite, space station, Moon.

c. space station, geostationary satellite, Moon.

d. geostationary satellite, Moon, space station.

3. Suppose that we have an asteroid that orbits the Sun. The asteroid is on a more elliptical orbit than the Earth, but at its furthest distance from the Sun, it is as far away from the Sun is as the Earth is on average. Draw a sketch of the orbit. We can conclude that for this asteroid, an orbital period is:

a. Less than for the Earth.

b. The same as for the Earth.

c. Longer than for the Earth.

d. We can't say much without knowing more.

4. Most comets move on very elliptical orbits around the sun that take them far beyond the orbit of Pluto. We can only see comets when they are close the sun because then they form their tails which are illuminated by the sun. We can conclude:

a. That there are not many comets out there since we only see a few each year.

b. That the best time of the year to expect to see comets is the summer.

c. Nothing about the number of comets that might exist.

d. There must be many more comets out there than we can see at any given time.