Pluto was once considered the ninth planet, but when NASA’s New Horizons spacecraft finally reached it, scientists discovered a world far stranger than anyone expected.

Frozen mountains, nitrogen glaciers, strange weather, and enormous geological features revealed that Pluto may not be a dead ball of ice. Beneath its frozen surface, scientists believe there could even be a hidden ocean of liquid water.

In this documentary, we explore what New Horizons discovered, how Pluto’s mysterious heart-shaped region formed, why its mountains may be made of water ice, and what the possibility of an underground ocean could mean for our understanding of distant worlds.

Could Pluto still be changing beneath its frozen surface? And what else might scientists discover if a future spacecraft ever enters orbit around it?

Watch until the end to discover why this tiny world may be one of the most fascinating places in our solar system.

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