• I'd bet almost anything that life from another planet, if formed independently from life on Earth, would be more different from all species of Earth life than any two species of Earth life are from each other.

    Neil deGrasse Tyson: I'd bet almost anything that life from another planet, if formed independently from life on Earth, would be more different from all species of Earth life than any two species of Earth life are from each other.
    Neil deGrasse Tyson (2007). “Death by Black Hole: And Other Cosmic Quandaries”, p.306, W. W. Norton & Company