Marc Kaufman on First Contact

Are we alone in the universe?  Almost certainly not.   The young science of astrobiology is closing in on a discovery that will rock our world:  there IS life beyond earth.  New telescopes, new missions, and new discoveries in outer space and in the most remote areas of our own planet all point to one conclusion.  Extra terrestrial life exists, and we're very close to finding it.   Science writer Marc Kaufman explains what's changed.