Private enterprise can never lead a space frontier. It's not possible because a space frontier is expensive, it has unknown risks and it has unquantified risks.
Neil deGrasse TysonFor your own safety, do not ever tell an astrophysicist, I hope all your stars are twinkling.
Neil deGrasse TysonEinstein's theory, we know that it fails. In advance, we know it fails. So that a deeper understanding of nature is awaiting us.
Neil deGrasse Tyson