2:00Why the sky looks blue – the science behind itSunlight hits gas molecules in the atmosphere and its wavelengths scatter in different ways. That makes the sky appear blue during the day, while at sunrise and sunset red light dominates.
4:20Spain’s first female astronaut: Sara García AlonsoShe’s a molecular biologist who is about to become the first female astronaut in Spain’s history. But before she can take off, she has to complete ESA’s Astronaut Reserve training in Cologne.
2:49Will we one day find intelligent life beyond our planet?The Drake Equation explores the idea of how many civilizations might exist in the Milky Way. But with many variables unknown, it can predict lots of aliens or practically none.