Question

what is a nebula?
○ a large disk of dust and gas in space
○ a large disk of dust and liquid in space
○ a large cloud of dust and liquid in space
○ a large cloud of dust and gas in space
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Explanation:

A nebula is defined as a large cloud - like structure in space composed of dust and gas (not liquid, and the structure is more like a cloud than a disk). So the correct option is the one that describes it as a large cloud of dust and gas in space.

Answer:

D. a large cloud of dust and gas in space (assuming the options are labeled A, B, C, D in order, with the last option being D)