9. which term does not describe a type of galaxy?
spiral
nebular
irregular
elliptical

I think that the correct answer is that the nebular galaxy is not a such thing in my opinion so this is why I think that nebular is the correct answer

Explanation:

Nebular

Explanation: Galaxy is a system of stellar remnants, stars, dust, gas and dark matter, held together by gravitational attraction. Galaxies are classified as elliptical, spiral or irregular on the basis of visual structure.

Nebula is a part of galaxy where new stars and planetary systems are formed. It is a cloud of dust and gas. It may come from the explosion of dying stars, for example supernova.