What is really happening in space during the periods when we see Mars going through apparent
Earth and Mars are moving in opposite directions around the Sun.
Mars and the Sun both appear to be in the same constellation as viewed
Based on what you have learned from your rankings in Parts A and B, which of the following planets
would you expect to have seasons most like Earths?
Uranus (axis tilt = 97.9)
Jupiter (axis tilt = 3.1)
Mars (axis tilt = 25.2)
Youve now seen that Earths varying distance cannot be the cause of our seasons. So what is the cause
of the seasons?
The seasons are caused by variation in the amount of rainfall (or snowfall) in different places at
different times of year.
The tilt of Ea
Based on what you have learned from your rankings in Parts A and B, which statement best describes
how variation in the Earth-Sun distance affects the seasons?
The variation in EarthSun distance over the course of each year has virtually no effect
If you wanted to document the apparent retrograde motion of Mars, you would need to measure and
record Mars's _ over a period of _.
Check two responses below: one for each of the two blanks in the question.
(Blank 1) position among the constellatio
Consider a time when Mars is in the middle of one of its periods of apparent retrograde motion. During
this time, Mars appears _ in our night sky and crosses the meridian around _.
Check two responses below, one for each of the two blanks in the question.