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 ...