The Planets - Series 1: 2. The Two Sisters - Earth and Mars - Audio Described

Name: The Planets - Series 1: 2. The Two Sisters - Earth and Mars - Audio Described
Description: Professor Brian Cox continues his tour of the solar system, revealing that it was once home to not one, but two blue planets.

Professor Brian Cox continues his tour of the solar system, revealing that it was once home to not one, but two blue planets.