I'll give you a question, please answer with step-by-step reasoning process. He looked up for a certain star, it was the one that helped him spot the rest of the what?
Options:
- solar system
- night sky
- hollywood
- constellation
- red carpet

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
He spotted the whole constellation when he looked at a certain star. As he looked up for a certain star it was the one that helped him spot the rest of the constellation.
The answer: constellation.