“Better the hard truth, I say, than the comforting fantasy.”

There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.

Stars are phoenixes, rising from their own ashes.

The cure for a fallacious argument is a better argument, not the suppression of ideas.

Where we have strong emotions, we’re liable to fool ourselves.

Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.

For small creatures such as we the vastness is bearable only through love.

An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.

The only thing we’ve found that makes the emptiness bearable, is each other.

Exploration is in our nature. We began as wanderers, and we are wanderers still. We have lingered long enough on the shores of the cosmic ocean. We are ready at last to set sail for the stars.

If it can be destroyed by the truth, it deserves to be destroyed by the truth.

Your god is too small for my universe.

A galaxy is composed of gas and dust and stars – billions upon billions of stars. Every star may be a sun to someone.

One of the great commandments of science is: Mistrust arguments from authority.

Extinction is the rule. Survival is the exception.

I don’t want to believe. I want to know.

If we ruin the earth, there is no place else to go.