We're in very bad trouble if we don't understand the planet we're trying to save.

No other planet in the solar system is a suitable home for human beings; it's this world or nothing. That's a very powerful perception.

Our posturings, our imagined self-importance, the delusion that we have some privileged position in the universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark.

The boundary between space and the earth is purely arbitrary. And I'll probably always be interested in this planet - it's my favorite.

In our obscurity - in all this vastness - there is no hint that help will come from elsewhere to save us from ourselves. It is up to us.

The Earth is a very small stage in a vast cosmic arena.