In any case, the leading edge of our "on purpose" radio signals is 30 light-years away and, if intercepted, may mend the aliens' image of us based on the radio bubble of our television shows. But this will happen only if the aliens can somehow determine which type of signal comes closer to the truth of who we are, and what our cosmic identity deserves to be.

Some air you inhale was exhaled by Cleopatra.

There is no greater education than one that is self-driven.

Facts are true whether or not you believe them.

When I needed to overcome the low expectations of others or the bias that would be expressed in one circumstance or another, I'd keep on keeping on. And I climb over the obstacle, go around it, dig under it, fly over it. That's what kept me going. Otherwise I would have never been an astrophysicist.

Perhaps we’ve never been visited by aliens because they have looked upon earth and decided there’s no sign of intelligent life.

If each dead person became a ghost, there'd be more than 100 billion of them haunting us all. Creepy, but cool.