Does the Universe abound with countless other planets teeming with life? Are we on the edge of a new era, soon to discover life elsewhere in the universe? Will at least one of those countless other "new" planets provide some hint that we share the vastness of space with other life? Or are we alone in the Universe? These are the big questions which have preoccupied scientists and philosophers alike for centuries. "In Search of New Worlds" helps answer these questions.

As the show explains, the elusive and apparently non-existent Planet X teased astronomers and astrophysicists with a display of gravitational pull that held promise for a tenth planet in our solar system. Never seen and never confirmed by exhaustive search methods, Planet X fostered growing speculation that no new planets of significance are likely to be found within our solar system. The search for other worlds in other star-sun systems, or extrasolar systems--already has reaped rewards. Several planets have been discovered beyond our solar system and many more are expected to be identified as technology extends astronomy's field of vision.