which phrase best defines a galaxy?\n tightly packed group of older stars\n large grouping of more than two…

which phrase best defines a galaxy?\n tightly packed group of older stars\n large grouping of more than two stars\n loose, disorganized star cluster held together by gravity\n large collection of stars, gas, and dust held together by gravity
Answer
Brief Explanations:
A galaxy is a massive system consisting of stars, gas, dust and is bound together by gravity. The other options do not fully capture the nature of a galaxy.
Answer:
large collection of stars, gas, and dust held together by gravity