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S05E02: Mystery of Planet 9

Scientists have discovered a mysterious ninth planet on the very edge of our solar system. Ten times the size of Earth, this strange world could have moons with extraterrestrial life.

Genres:

Air Date:

Nov 29, 2016

Runtime:

42 minutes

Production:

Discovery Channel

Casts:

How the Universe Works

Volcanoes - The Furnaces of Life

Megastorms - The Winds of Creation

Exoplanets - Planets from Hell

Megaflares - Cosmic Firestorms

Extreme Orbits - Clockwork and Creation

Comets - Frozen Wanderers

Asteroids - Worlds That Never Were

Birth of the Earth

Journey from the Center of the Sun

The End of the Universe

Jupiter: Destroyer or Savior?

First Second of the Big Bang

Is Saturn Alive?

Weapons of Mass Extinction

Did a Black Hole Build the Milky Way?

Our Voyage to the Stars

The Search for a Second Earth

How the Universe Built Your Car

Edge of the Solar System

Earth, Venus's Evil Twin

Monster Black Hole

Forces of Mass Construction

Secret History of the Moon

The First Oceans

Most Amazing Discoveries

Mystery of Planet 9

Black Holes: The Secret Origin

Secret History of Pluto

Stars That Kill

The Universe's Deadliest

Life and Death on the Red Planet

The Dark Matter Enigma

Strangest Alien Worlds

Are Black Holes Real?

Strange Lives of Dwarf Planets

Twin Suns: The Alien Mysteries

Uranus & Neptune: Rise of the Ice Giants

The Quasar Enigma

Death of the Milky Way

War on Asteroids

Secret History of Mercury

Dark History of the Solar System

Mystery of Spacetime

Nightmares of Neutron Stars

When Supernovas Strike

The Interstellar Mysteries

How Black Holes Made Us

Secret World of Nebulas

Did the Big Bang Really Happen?

Battle of the Dark Universe

Hunt for Alien Life

Finding the New Earth

Cassini's Final Secrets

Asteroid Apocalypse: The New Threat

NASA's Journey to Mars

Hunt for Alien Evidence

Death of the Last Stars

Secrets of Time Travel

When NASA Met Jupiter

Edge of the Universe

Monsters of the Milky Way

Earth's Death Orbit

Journey to a Black Hole

Mission to a Comet

Secrets Of The Sun

Aliens of the Microcosmos

Curse of the White Dwarf

War of the Galaxies

The Next Supernova

Secret Lives Of Neutrinos

Birth of Monster Black Holes

Gravitational Waves Revealed

Mystery of Alien Worlds

Secrets of the Cosmic Web

Curse of the Cosmic Rays

Hunt for Dark Matter

Dark History of Earth

Hunt for the Universe's Origin

Voyager's Ultimate Mission

The Moons of Saturn

A Robot's Guide to Mars

Most Violent Event in the Universe

Asteroid: Countdown to Catastrophe

Solar System Special

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