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In 2014, the International Space Station had to move three times to avoid lethal chunks of space debris and there is an increasing problem of satellites mysteriously breaking down. With first-hand accounts from astronauts and experts, Horizon reveals the scale of the problem of space junk. Our planet is surrounded by hundreds of millions of pieces of junk moving at 17,000 miles per hour. Now the US government is investing a billion dollars to track them, and companies around the world are developing ways to clear up their mess - from robot arms to nets and harpoons. Horizon investigates the science behind the hit film Gravity and discovers the reality is far more worrying than the Hollywood fiction.

Other episodes for this season

Should I Eat Meat? The Big Health Dilemma
Episode 1 - Should I Eat Meat? The Bi...
Should I Eat Meat? How to Feed the Planet
Episode 2 - Should I Eat Meat? How to...
Allergies: Modern Life and Me
Episode 3 - Allergies: Modern Life an...
Inside the Dark Web
Episode 4 - Inside the Dark Web
Ebola - The search for a cure
Episode 5 - Ebola - The search for a...
Is your Brain Male or Female?
Episode 6 - Is your Brain Male or Fem...
Secrets of the Solar System
Episode 7 - Secrets of the Solar Syst...
Aftershock: The Hunt for Gravitational Waves
Episode 8 - Aftershock: The Hunt for...
Dancing in the Dark - The End of Physics?
Episode 9 - Dancing in the Dark - The...
70 Million Animal Mummies: Egypt's Dark Secret
Episode 10 - 70 Million Animal Mummies...
Is Binge Drinking Really That Bad?
Episode 11 - Is Binge Drinking Really...
The Trouble with Space Junk
Episode 12 - The Trouble with Space Junk
Are Health Tests Really A Good Idea?
Episode 13 - Are Health Tests Really A...
First Britons
Episode 14 - First Britons
OCD: A Monster In My Mind
Episode 15 - OCD: A Monster In My Mind
Which Universe Are We In?
Episode 16 - Which Universe Are We In?
Cosmic Dawn: The Real Moment of Creation
Episode 17 - Cosmic Dawn: The Real Mom...
Are Video Games Really That Bad?
Episode 18 - Are Video Games Really Th...