Which phrase best defines a galaxy?

Galaxies are basically billions and billions of stars, gas, and  dust packed together which forms a galaxy.

The phrase that best defines a galaxy is "large collection of stars, gas, and dust held together by gravity".

large collection of stars, gas and dust held together by gravity.

Explanation:

A galaxy billions of stars, dust and gases. These are held together by gravity.

A galaxy comprises sites of new star formation in nebulae and old star clusters. It has globular clusters as well as loose, dis-organised open clusters.

Usually at the center of each galaxy, there is a super massive black-hole about which all the material in the galaxy rotates about.Galaxies have mainly three types of shapes- spiral, elliptical and irregular.

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.

airlines i think? or a cruise boat? does this work out for u? ?