The remarkable feature of physical laws is that they apply everywhere, whether or not you choose to believe in them. After the laws of physics, everything else is opinion.

We are not simply in the universe, we are part of it. We are born from it. One might even say we have been empowered by the universe to figure itself out - and we have only just begun.

If you get asteroids about a kilometer in size, those are large enough and carry enough energy into our system to disrupt transportation, communication, the food chains, and that can be a really bad day on Earth.

After all, what nobler thought can one cherish than that the universe lives within us all?

Science is a cooperative enterprise spanning the generations. It's the passing of a torch from teacher to student to teacher. A community of minds, reaching back to antiquity and forward to the stars.

All tweets are tasty. Any tweet anybody writes is tasty. So, I try to have each tweet not simply be informative, but have some outlook, some perspective that you might not otherwise had.

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.