Question

a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity is known as....
galaxies
universes
planets
black holes

Explanation:

• Galaxies are large - scale systems consisting of gas, dust, stars, and solar systems bound by gravity.
• Universes refer to the entire expanse of all matter, energy, space, and time.
• Planets are celestial bodies that orbit stars.
• Black holes are regions in space with extremely strong gravitational fields.

Answer:

galaxies