Biggest things in space

Category: Astronomy

On Earth and in the Universe, size matters, but it matters in different ways. In Space, bigger is not necessarily better.

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Space Volcanoes

Volcanoes have long helped shape the Earth. But what is less well known is that there are volcanoes on other planets and moons that are even more extraordinary than those on our own home planet. Horizon follows an international team of volcanologists in Iceland as they draw fascinating parallels between the volcanoes on Earth and those elsewhere in the solar system. Through the team's research, we discover that the largest volcano in the solar system - Olympus Mons on Mars - has been formed in a similar way to those of Iceland, how a small moon of Jupiter - Io - has the most violent eruptions anywhere, and that a moon of Saturn called Enceladus erupts icy geysers from a hidden ocean. Computer graphics combined with original NASA material reveal the spectacular sights of these amazing volcanoes. Along the way, we learn that volcanoes are not just a destructive force, but have been essential to the formation of atmospheres and even life. And through these volcanoes of the solar system, scientists have discovered far more about our own planet, Earth - what it was like when Earth first formed, and even what will happen to our planet in the future.

Horizon • 2017 • Astronomy

The First Oceans

For years, scientists suspected that the oceans came from molecules delivered to Earth from distant stars by asteroids, but a new discovery suggests that their true origins may be more exotic.

S4E7How the Universe Works • 2015 • Astronomy


From giant burning gas spheres to icy orphaned worlds wandering in interstellar space, explore the strange planets that inhabit the vast spread of the universe.

S1E7How the Universe Works • 2010 • Astronomy


We strip apart comets, peeling away their dusty layers and their iconic tails to reveal the secrets of these mysterious visitors from deep space.

6/6Strip the Cosmos • 2014 • Astronomy

The Long Astronomical Perspective

Carl Sagan talks about our future and the exploration of space

7/10The Sagan Series • 1989 • Astronomy

Death of the Milky Way

The Milky Way is dying, and experts are investigating what's killing it.

How the Universe Works • 2018 • Astronomy