Use the following list of words to complete the sentences which follow

Use the following list of words to complete the sentences which follow
Universe Moon Sun gravity planets galaxy satellite
The Solar System contains a number of _____which orbit the __________.Oun Sun is one of the many millions of stars that from a swiring group called a _________.These swriling groups are held together by __________.There are millions of these swiring groups of stars ,which all together from the __________.