transkei question to you, is there life similar to what we have here on earth in your views similar summerall sonorous? >> i think the chances are very strong. but it is a bit unknown question of how likely is that that if you have a planet that is about the right instrument stars that can be liquid on the service and have the solitude surface, how likely is it that life will get started there. no one has been certified yet. since the universe has so many planet, so many galaxies, each galaxy having so many stars, no stars having planet, i think the chances overwhelming that there is life elsewhere in the universe. elsewhere in our galaxy is entirely different question. i can't make an educated guess. >> is the speed of light the ultimate speed still? >> yes and no. much of our thinking of physics is based on the theory of relativity, which requires a maximum speed college is also the speed of light. it's not just a speed of light. it's the speed of gravitational waves and anything else that as any other particle wave that has no mass. there is an experiment performed recently and announced i