I put 40 Billion marbles in the Colosseum to find alien life

Transcript

I'm going to turn all the planets in our galaxy that could have alien life into marbles and put them in here, the Colosseum in Rome, to give an idea of just how many planets could be like Earth that could have alien life. Then I'm going to show you how one of these blue marbles, a planet that we found recently, might actually have alien life on it.... Read More