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Series 1: 2. Dark Worlds

Professor Brian Cox explores the solar system’s hidden realms, between and beyond the planets, where countless worlds lie shrouded in darkness.\n\nHe visits some of its least explored regions and finds out what lies beyond the reach of even the most powerful telescopes. The solar system is not just a few worlds orbiting close to the Sun - it’s an enormous structure that stretches halfway to the nearest star.

Source: BBC 2