Match each galaxy to its description.

a. the milky way
b. elliptical galaxy
c. irregular galaxy
1. contains dust, gas and young stars
2. contains mostly older stars with a red color
3.arms extend from a core full of black holes

(1)    Answer is C – Irregular galaxy

This type of galaxy does not have a clear shape. It contains high amount of young stars, gas and dust.  Among the gases, hydrogen is the most abundant gas. It causes to form new stars.

(2)    Answer is A – Milky way

These types of galaxies have a clear shape as ellipsoidal shape. Elliptical galaxies have less number of stars and dust. The formation of new stars is low. Hence, the brightness is low. According to Edwin Hubble, elliptical galaxy is one of three classes of galaxies.

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