Question : In the life cycle of a star, the stage nebula refers to:
Option 1: the stage when the outer layers expand, cool down and become less bright
Option 2: a cloud of dust and hydrogen
Option 3: the last stage of its life
Option 4: the outer shell of a star
Correct Answer: a cloud of dust and hydrogen
Solution : The correct answer is a cloud of dust and hydrogen .
The first stage in the evolution of all stars involves the formation of a nebula. A nebula is a cloud of dust and gas which has been collected together by gravity in a process known as accretion. The gas and dust come together to form a protostar, which gets very hot until it turns into a main sequence star.
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