This animation demonstrates very simply how different elements at different heights, let off energy that we see as different colors.
Click on image for full size
Axis Tilt
Axis tilt means that as a planet goes around
the Sun, it isn’t sitting straight up--it’s tilted! The Earth is
tilted by 23.5 degrees, which means that sometimes the northern hemisphere is tilted toward the Sun and sometimes it is tilted away from the Sun.
Not all the planets have the same amount of tilt. Jupiter has almost no tilt (3 degrees). Venus has almost 180 degrees of tilt, which means that it’s spinning upside-down (at least relative to our definition of up). Uranus has a tilt of almost 90 degrees, which means that it's spinning on its side!
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