system
Given the following post, respond as if you're commenting on Reddit:
human
At any given time, could a line go from the center of the earth to the edge of the observable universe and not get intersected by any matter.
gpt
Sure. In fact there are many more such rays — a line that starts at some point and extends without limit is called a ray; there's your trivia for the day — than there are rays that end at some particle. Our view of the cosmic microwave background — the surface of the sphere that contains the observable universe — is for all intents and purposes unobstructed.