As the third millennium begins, humankind has finally achieved the technical means to address a question that is both old and profound: arc we alone in the universe? Despite the fact that alien beings regularly infest movies and television shows, there is still no compelling evidence for any living creatures beyond Earth. But there are highly suggestive reasons to believe that the star fields of the cosmos are teeming with life, some of it intelligent. In this series of twelve lectures, we consider what science can tell us about the possibility of intelligent life in space, how we might find it, and what it would mean if we did. The First two lectures set the stage in our quest for cosmic company. One of the principal achievements of as in the last four centuries has been to show that our physical pine in the universe is anything but special. The glow of ten thousand billion billion stars lies within the purview of our telescopes, and one in ten is similar to our Sun. We occupy only a tiny speck of real estate in a massive, expanding universe that was brought into being approximately twelve billion years ago. Our own solar system is relatively new, being only one-third the age of the oldest stars, and consequently what has happened here — the emergence of biology and technically sophisticated life — may have happened billions of years earlier elsewhere. Even in the eighteenth century, when we had little knowledge of the universe’s vast extent, the possibility that nearby planets might house sentient beings was considered. Mars, in particular. am-acted early attention, and a century ago it was posited to be the home of an advanced society busy lacing the landscape with a network of canals.

password (if needed): merapid

password (if needed): merapid

password (if needed): merapid

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