From the smallest cell to the solar system, Science HD is an odyssey of scientific facts, investigations and breakthroughs.

Science HD

From the smallest cell to the solar system, Science is an odyssey of scientific facts, investigations and breakthroughs.

Science

A probe malfunctions without cause as it enters deep space; a mission goes astray when an imposter breaches Mission Control; evidence of an invisible planet within the Solar System.

NASA's Unexplained Files

Mystery of the Invisible Planet

Cosmonauts are trapped in a capsule in a frozen lake; a NASA scientist investigates the Hindenburg; the full moon affects experiments.

Curse of the Full Moon

The discovery of geysers on a moon; NASA's mission to detect life; an object is spotted approaching an asteroid.

A President's Close Encounter

Evidence of alien technology around a distant star; speculation about Pluto's surface; Apollo astronauts are at a loss of words to describe an object they encountered while they approached the moon.

Pluto's Stranger Things

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A Mars mission captures an image of a strange structure on the planet; an intriguing sight on the dark side of the moon; a planet-eating star gives scientists a peek of Earth's bleak future.

S4 E2 | Rise of the Planet Killer