Equator

Revolution

Equinox

Rotation

When it is winter in the Southern Hemisphere

March 21 or September 21

orbit

Solstice

June 21

What causes seasons?

A galaxy with a nucleus of bright stars and two or more spiral arms

Red shift

Nebula

Waxing

Waning

The lunar cycle

lunar eclipses

The sun is...

The driving force that creates the light and heat of a star

protostar

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