Professor Avi Loeb: 'It would be arrogant to think we're alone in the universe'

Flight of the SPIDER: Astronomers are preparing to launch a balloon-borne telescope above Antarctica this December, helping them view the beginning of the universe from the end of the Earth.

Ask Ethan: Could We Be Living In A Steady-State Universe?

The One-Way Speed of Light. The speed of light has always been ~300,000 km/s in all directions, right? But what if it wasn't? What would it mean for our Universe if c was not the same?