Julian's Discovery of a Comet

Read the following passage:

Julian was fascinated by the stars. Every night, he would take his telescope to the roof of his apartment building, where the city lights faded into the background. He loved learning about constellations and spent hours flipping through books on astronomy. One evening, while observing the sky, he noticed a bright object moving unusually fast across the constellations. Curious, he noted its path and recorded the time it appeared. He later discovered that it was a comet, which had not been visible for decades.