___________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.
A)Irregular
B)S0
C)E7
D)Sa
E)E0

Question

Quizplus · Accepted Answer

Irregular galaxies, as the name suggests, do not have a distinct shape or structure. They are often characterized by large clouds of gas and dust, as well as young and old stars. They do not have a well-defined nucleus or spiral arms, making them the best choice for this question. Option B) S0 is a lenticular galaxy with a disk-like structure but no spiral arms, while options C) E7 and E) E0 are elliptical galaxies with no gas, dust or recent star formation. Option D) Sa is a type of spiral galaxy with a well-defined nucleus and tightly-wound spiral arms.

___________ Galaxies Contain Large Clouds of Gas and Dust, Both