Stars vs Planets in the Night Sky Both appear as bright dots How would we tell them apart?

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Presentation transcript:

Stars vs Planets in the Night Sky Both appear as bright dots How would we tell them apart?

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:

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.

Discussion: Think, Pair, Share Where do you predict Saturn will appear one month later? Sky Picture #1Sky Picture #2

Sky Picture #3 Describe how Saturn “Wanders” against the background stars. Let’s see if you’re right!

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?

Saturn view through a telescope

Path of Mars over time

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