Astronomers have discovered bizarre planets very different to Earth out in the galaxy, but will we ever locate a planet similar to our own?
Astronomers have discovered bizarre planets very different to Earth out in the galaxy, but will we ever locate a planet similar to our own?
Episode 2
Dwarf planets are some of the solar system's most active places, from oceans of liquid water on Pluto to vanishing volcanoes on icy Ceres.
Episode 3
Half of the star systems in our galaxy have two stars, possibly creating habitats for alien life. Here, binary stars fling entire worlds into space.
Episode 4
New research shows the migration of ice planets may have helped start life on Earth, and stopped it being destroyed. How are they so vital?
Episode 5
Quasars are the brightest objects in space, powered by black holes, and the most mysterious. How do they shape the universe and ultimately aid in its destruction?
Episode 6
The Milky Way is dying and scientists are trying to discover what's killing it. Scientists must trace its whereabouts over the past 13.6 billion years.
Episode 7
Once thought to be an inevitable disaster, scientists now have the technology to prevent asteroids from hitting the Earth. How are they working to do this?
Episode 8
For four years, the Messenger space probe sent images of Mercury, the solar system's smallest planet, closest to the Sun. Could it threaten life on Earth?
Episode 9
The solar system is different to others in the Milky Way, but it hides a violent past. Scientists examine the clues to reveal its secret history.
Episode 10
Space isn't as empty as it seems. It conceals a secret structure called spacetime - an invisible field that governs our lives.