After it was part of a nebula and before it was the Sun, our Sun was a ________.
A) star
B) galaxy
C) asteroid
D) comet
E) protostar

Name: After it was part of a nebula and before it was the Sun, our Sun was a ________. A) star B) galaxy C) asteroid D) comet E) protostar
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Question

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Before the Sun became a fully-fledged star it was a protostar, which is essentially a contracting cloud of gas and dust that has not yet begun to undergo nuclear fusion reactions in its core.

After It Was Part of a Nebula and Before It