How many stars are there in the universe? Are there more stars out there than grains of sand on Earth? Thanks to advanced space telescopes, we've been able to peer farther into deep time and the distant universe than we ever thought possible, and we might finally be able to answer these mind-boggling questions.

Originally released by Knowledgemotion, 2015. Streaming video file encoded with permission for digital streaming by Infobase on February 21, 2020.