Again I'm being a bit self-serving, but I think Neil deGrasse Tyson put it better [1, from 1:35-2:30]: [1] https://www.youtube.com/watch?v=a0SUpwIAjQs&t=1m35s

Again I'm being a bit self-serving, but I think Neil deGrasse Tyson put it better [1, from 1:35-2:30]: [1] https://www.youtube.com/watch?v=a0SUpwIAjQs&t=1m35s https://www.youtube.com/watch?v=a0SUpwIAjQs&t=1m35s