You cannot study other planets without referring to Earth and without applying the techniques and the insights of Earth science. And you cannot really do a good job understanding the Earth without the insights from planetary exploration.

When you think about alien intelligences making art, you then have to think about what art is and how bound up it is in the nature of consciousness. Why do we make art? And what can we expect to have in common with other creatures in universe?

Among the radio astronomers of SETI - the Search for Extraterrestrial Intelligence - it's only sort-of a joke that the true hallmark of intelligent life is the creation of radio astronomy.

Why should we consider defining intelligence as something global and as something that hasn't actually yet appeared on Earth? It may be useful for envisioning the future of our own civilization and any others that may be out there among the stars. It might give us something to strive for.

Climate change is a very real threat right now to our economy, the future of our children, to our way of life.

She's born and raised with wildlife, living with a zoo. What would be strange for Bindi is if she were in an apartment in suburbia with a goldfish.

Because of climate changes, it's not just a question of producing energy. It's a question of producing energy in a way that we can live with in the long term. If you look at the available pieces, from conservation to nuclear, solar, whatever, and you put them all together, we can't do it.

The weather in California is so much hotter than it is in England that it's absolutely changed my style. I have many more dresses and shorts than I ever thought I would coming from U.K.! It's so much easier to dress femininely in a warm climate.