In August 2014, European spacecraft Rosetta became the first ever to catch up with a comet, a landmark stage in a decade-long space mission that scientists hope will help unlock some of the secrets of the solar system. The Rosetta will orbit Comet 67P/Churyumov-Gerasimenko, with a landing planned for November. CBC's science expert Bob McDonald explains the mission's objectives.

From the Curio.ca streaming audio-visual collection.