Question

select the true statements. the universe contains all space. stars cluster together to create galaxies. a galaxy is a collection of astronomical bodies orbiting a central star. light - years are used to measure distances within galaxies.

Explanation:

The universe encompasses all of space. Stars group together to form galaxies. A galaxy is a collection of various astronomical bodies and not just orbiting a single central star (it can have a super - massive black hole at its center among other things, but is a collection of stars, planets, gas, dust etc.). Light - years are a unit of distance used to measure vast distances within and between galaxies.

Answer:

The universe contains all space.
Stars cluster together to create galaxies.
A galaxy is a collection of astronomical bodies orbiting a central star.
Light - years are used to measure distances within galaxies.