The observable universe is finite, but whether it extends infinitely is unknown. Scientists estimate that the observable universe—the part we can see with telescopes—is about 93 billion light-years across. This is because light takes time to travel, and we can only observe objects whose light has had enough time to reach us since the Big Bang.
However, what lies beyond what we can observe remains a mystery. Some theories suggest the universe could be infinite, stretching endlessly beyond our view. If this is true, there could be countless galaxies, stars, and even planets far beyond what we can ever see. However, we currently have no way to confirm this because light from those distant regions hasn’t reached us yet.
Another possibility is that the universe is finite but unbounded, meaning it could curve back on itself like the surface of a sphere. If this were the case, traveling far enough in one direction might eventually bring you back to where you started—like walking around the Earth.
