The Planets: Inner Worlds
The rocky planets Mercury, Venus, Earth and Mars all have similar origins, but only one supports life.
More from Season 46
Episode 1
Pluto and Beyond
Since it explored Pluto in 2015, the New Horizons spacecraft has been zooming toward NASA’s most distant target yet. Join the mission team as the probe attempts to fly by Ultima Thule, an object 4 billion miles from Earth.
Episode 2
Einstein's Quantum Riddle
Einstein called it “spooky action at a distance,” but today quantum entanglement is poised to revolutionize technology from computers to cryptography. Physicists have gradually become convinced that the phenomenon—two subatomic particles that mirror changes in each other instantaneously over any distance—is real.
Episode 3
Kïlauea: Hawai'i on Fire
Journey to Hawaii's Kilauea volcano, which sent rivers of lava through communities and into the sea when it erupted in 2018. A group of scientists and locals investigate the spike in volcano activity that turned paradise into an inferno.
Episode 4
Decoding the Great Pyramid
New archeological evidence sheds light on the stunning engineering of the Great Pyramid of Giza.
Episode 5
Rise of the Rockets
With new technologies, NASA and private companies are promising a new renaissance in space travel.
Episode 6
The Next Pompeii
In the shadow of Vesuvius and Pompeii, a lesser-known volcano puts the city of Naples at risk.
