Are alien civilizations really possible? If extraterrestrials exist, where are they? How likely is it that somewhere in the universe an Earth-like planet suppor

Originally published in Great Britain by Profile Books Ltd, 2016.

'VISIONARY' Stephen Greenblatt 'So interesting... I recommend [Extraterrestrial] to people who have any interest in this extraordinary subject of life existing

In the twenty-first century, the debate about life on other worlds is quickly changing from the realm of speculation to the domain of hard science. Within a few

Astronomers around the world are pointing their telescopes toward the heavens, searching for signs of intelligent life. If they make contact with an advanced al