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Published byBertram Sullivan Modified over 9 years ago
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Stars vs Planets in the Night Sky Both appear as bright dots How would we tell them apart?
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Sky Picture #1 Which one of these points of light do you think is Saturn? Here is a picture of the planet Saturn among the stars:
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Sky Picture #2 Can you see anything different about it? Here is another picture made one month later, showing the same part of the sky.
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Discussion: Think, Pair, Share Where do you predict Saturn will appear one month later? Sky Picture #1Sky Picture #2
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Sky Picture #3 Describe how Saturn “Wanders” against the background stars. Let’s see if you’re right!
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Explanation: The planets appear to wander at different speeds and in different directions from month to month. Why do you think this happens? How would the Sky Pictures look through a telescope?
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Saturn view through a telescope
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Path of Mars over time
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Retrograde Motion Occurs because of the differences between the speed, and shape of the Earth’s orbit and other planets The most prominent one is of Mars Retrograde Motion Simulator
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