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After studying this unit, you should know that:
- By observing the sky we can understand the movement of the earth in the universe.
- The succession of the days and the nights and the change in the seasons are consequences of this movement.
- The earth is only one of
the planets in the solar system and the moon, the sun, the asteroids
and the comets are our companions in the solar system.
- Our sun is just another of the stars which inhabit our galaxy.
- The spiral galaxy where
the sun and the Milky Way are is just one of the thousands of millions
of galaxies in our expanding universe.
If you want to check that you have understood all this, click on the control to start our evaluation exercises. 
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