Answer the following question given this paragraph: 

Television broadcasts also use radio waves. Sounds are encoded with frequency modulation, and pictures are encoded with amplitude modulation. The encoded radio waves are broadcast from a TV tower like the one in Figure below . When the waves are received by television sets, they are decoded and changed back to sounds and pictures.


Q: What are groups of tens to hundreds of thousands of stars held tightly together by gravity called?

 Choices:

- elliptical clusters

- elongated clusters

- galaxy

- globular clusters

A:
globular clusters
