NARRATOR: When we look beyond Earth, we discover dynamic worlds. KATHERINE DE KLEER: As we're exploring the solar system, we are finding remarkably diverse and ferociously active worlds.

A collection of down-to-Earth facts about our planet and its place in the solar system. This collection introduces the Sun as the main source of light and heat on Earth. It explains that the Earth ...

Ptolemy’s model and many earlier ideas of the Solar System had the Earth at the centre of it. As observations of the motions of the planets became more detailed, the descriptions of the Solar ...