E8 • Strangest Alien Worlds

E1 • Mystery Of Planet 9

Astronomers speculate about our mysterioUnited States ninth planet.

44m • 2016

Astronomers speculate about our mysterioUnited States ninth planet.

E2 • Black Holes: The Secret Origin

Scientists reveal Pluto's life-sUnited Statestaining secret below its surface.

44m • 2016

Scientists reveal Pluto's life-sUnited Statestaining secret below its surface.

E3 • Secret History Of Pluto

Scientists reveal the evidence of and struggles suffered by life on Mars.

44m • 2016

Scientists reveal the evidence of and struggles suffered by life on Mars.

E4 • Stars That Kill

A space ship of crash test dummies explore space's deadliest spots.

44m • 2016

A space ship of crash test dummies explore space's deadliest spots.

E5 • The Universe's Deadliest

We dive in to learn how gigantic supermassive black holes are created.

44m • 2016

We dive in to learn how gigantic supermassive black holes are created.

E6 • Life & Death On The Red Planet

We're counting down NASA's top six sci-fi film-worthy stars.

43m • 2016

We're counting down NASA's top six sci-fi film-worthy stars.

E7 • The Dark Matter Enigma

New discoveries are revealing the truth about mysterioUnited States dark matter.

44m • 2016

New discoveries are revealing the truth about mysterioUnited States dark matter.

E8 • Strangest Alien Worlds

Astronomers research strange new planets that amaze the indUnited Statestry.

44m • 2016

Astronomers research strange new planets that amaze the indUnited Statestry.