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Transcript
Constellations and
Planets in the Night Sky
Created for TCSS
Stars are trillions of kilometers away,
far outside the solar system.
Even as the Earth moves through its
orbit around the Sun, each star
remains nearly the same distance
away.
Planets are closer to us than stars
and they are in constant motion as
they move around, or orbit, the sun.
Because of this, they can be seem
in different locations in the night sky
in relation to the constellations.
If you observed the planet Mars every
night for a while, at first it would appear
to move from west to east among the
stars. Then it would reverse direction for
a while and travel from east to west.
Finally, it would once again move in a
eastward direction. This is why the
Greeks called planets wanderers.
Movement of Mars across the sky over about a
two month period in 2005
a. Stars are too far away to see their
movement from Earth.
b. Planets orbit around the sun.
c. The motion of stars occurs over a long
period of time such as 100 years.
d. All of the above.