Question

the universe is composed of galaxies. galaxies are....
planets that are extra large.
a star plus the planets that surround them.
a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
planets that do not belong in our solar system.
question 2 (1 point)
listen
what are the three types of galaxies?
circular, square, and oval
light, dark, & medium
electromagnetic, electric, & magnetic

Explanation:

Galaxies are defined as a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. This is a fundamental astronomical concept. For the second question, the three main types of galaxies are Spiral, Elliptical, and Irregular. The other options in both questions do not align with standard astronomical definitions.

Answer:

For the first question: a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
For the second question: Spiral, Elliptical, & Irregular.