Question

stars often cluster together to form larger structures called galaxies. a galaxy also contains the stars planetary systems, as well as the gas and dust found between the stars. the milky way galaxy the galaxy that contains the solar system is called the milky way. the milky way is a large spiral galaxy that houses about 100 billion stars. average - sized galaxies contain about 100 million stars. supergiant galaxies, the largest galaxies in the universe, can contain over 100 trillion stars! select the true statements. average - sized galaxies have over 1 trillion stars. supergiant galaxies contain approximately 100 million stars. planets cluster together to form galaxies. galaxies contain stars and planets.

Explanation:

The text states that stars cluster to form galaxies and a galaxy contains stars' planetary systems. So, galaxies contain stars and planets. The other statements are incorrect as average - sized galaxies have about 100 million stars, supergiant galaxies can have over 100 trillion stars, and it is stars (not planets) that cluster to form galaxies.

Answer:

Galaxies contain stars and planets.