Question

Which phrase best defines a galaxy? Tightly packed group of older stars large grouping of more than two stars loose, disorganized star cluster held together by gravity large collection of stars, gas, and dust held together by gravity

Answer 1

Galaxy is a collection of millions or even billions of stars, gas, and dust held together by force of gravity, so the answer is: ´´a large collection of stars, gas, and dust held together by gravity´´.

Answer 2

Answer: Large collection of stars, gas, and dust held together by gravity.

Explanation:

• The name galaxy has been derived from the word galaxies which is a Greek word meaning milky.

• In simple words a galaxy is a collection of a large number of stars, however, to be more precise a galaxy is a gravity-bound collection of stars, dust, gas, dark matter and stellar remnants.

• There are different types of galaxies found in various shapes and size, some of the most common shapes being elliptical, irregular and spiral.

• An example is the milky way galaxy that contains our solar system.