Indebted

Black Holes are the Universe's ultimate monsters, sucking everything into their super-dense centres. There are an estimated ten million of these cosmic killers in our galaxy and once created they never die. What are the chances of Earth having a fatal encounter?

Even if we avoid destruction by asteroids, we face eventual melt-down, as our Sun is getting progressively hotter. New Worlds looks at where we could go to escape this fate and talks to scientists who are already exploring how we could turn a planet like Mars into a Noah's ark for the earth's animal and plant life. It may even be that humans have to change themselves genetically to survive.

Dr. Sagan compares the exhilaration of 17th-century Dutch explorers who ventured in sailing ships halfway around our planet in their quest for wealth and knowledge to an inside view of the excitement around Voyager's expeditions to Jupiter and Saturn. The newly acquired treasures of our present golden age of exploration are the focus of this episode.

Humans once thought the stars were campfires in the sky and the Milky Way "the backbone of night." In this fascinating segment Dr. Sagan takes us back to ancient Greece, when the basic question "what are the stars?" was first asked. He visits the Brooklyn elementary school of his childhood, where this same question is still on students' minds.

After Deb's Aunt Judith dies, she passes the torch of hosting shiva to Rebecca and Dave. They take this as an opportunity to put a modern spin on old traditions, which makes Debbie regret passing the torch to begin with. At the shiva, Joanna is worried she too will die alone, which forces her to look for love in unlikely places and people.