This problem has stumped scientists for thousands of years. In this video, we explore: - Why is the sky dark? (00:53) - Is ...

The question of whether the cosmos goes on forever is no longer just a late night thought experiment, it is a live research ...

Is the universe infinite? It's one of the most profound questions we can ask, and here's the short answer: We don't know. While we have learned a great deal about the universe, a portion of the cosmos ...

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol' Earth helps us understand what the universe might be doing beyond ...