This clip discusses the many impacts that space debris has caused on the planet Jupiter and how these collisions work.

What is the moon made of, and how did it form? Learn about the moon's violent origins, how its phases shaped the earliest calendars, and how humans first explored Earth's only natural satellite half a century ago.

This clip discusses the different phases of the moon and goes in to depth about each phase.

This song discusses Tarzan's fascination with the wider human world he has yet to see. During the song, he looks through a telescope and sees the Great Comet of 1882.

Penrose describes his black hole theory, which sparks an idea in Stephen's mind. Stephen reverses Penrose's theory and develops one of his own. Stephen suggests that the universe was born from a black hole exploding. The black hole has such strong space-time singularity that nothing can escape from it, even light. The black hole is triggered by the collapse of a star.