How the Universe Works: Season 6

Various eminent scientists explain the current knowledge of Black Holes and try to answer the question, do they really exist? The two great theories of Einstein's General Relativity and Quantum Mechanics don't work together to explain Black Holes which is a big problem. Other theoretical constructs such as Gravastars and Planck stars have been postulated but proving their existence is just as difficult as that of Black Holes. So where next?

Planets that orbit two suns instead of one might be deadly hell worlds, but new discoveries reveal that sci-fi star systems with binary stars might be optimal places for alien life.

Our solar system hides a dark and violent past, and new discoveries reveal that Earth and the planets were formed from the destruction of alien worlds that came before us.

The Milky Way is dying, and using the latest science and discoveries, experts are investigating what's killing it.

Uranus and Neptune are mysterious, icy worlds at the edge of our solar system, and new discoveries reveal that these strange planets may have helped start life on Earth.

Mercury has a dangerous secret that may one day threaten life on Earth.

Quasars are the brightest and most powerful objects in our universe, and though they have shaped the cosmos, they might ultimately destroy everything that exists.

New discoveries reveal the secrets of hundreds of strange, tiny worlds called dwarf planets.

Scientists discuss various types of asteroids, previous collisions between asteroids and Earth, and various technologies that may be employed to stop future collisions. Also discussed are ways in which nature can prevent or lessen the impact of collisions.

Spacetime is the secret structure that controls our universe, time, light, and energy.