BBC Earth

Professor Brian Cox traces the development of the four rocky worlds closest to the sun: Mercury, Venus, Earth and Mars; born together, they battled the unbelievable violence of the early solar system to become stable planets.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

Professor Brian Cox traces the development of the four rocky worlds closest to the sun: Mercury, Venus, Earth and Mars; born together, they battled the unbelievable violence of the early solar system to become stable planets.

Alaskans prepare for the winter months; Andy hunts moose; Sue heads to Fairbanks for a foot procedure; the hailstones teach their daughters to ice fish; Glenn repairs his cabin.

Sue travels 150 miles to investigate squatters on her property; Andy's sled begins to fall apart while he's collecting firewood; Chip and Agnes brave thin ice to harvest whitefish.

Chip builds a freight sled for winter travel; Sue is forced to brave a dangerous road to get home after a blizzard strands her in Fairbanks; Andy and Kate get their sled dogs ready for winter; Glenn tries to harvest meat for the winter.

Gators, tortoises and stunning seabirds of southwest Florida.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

The differences between the Northern and Southern Rockies.

Gators, tortoises and stunning seabirds of southwest Florida.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

Gators, tortoises and stunning seabirds of southwest Florida.

A hundred days without sunlight approach; Glenn needs to retrieve more wood for heat; Andy and Kate rescue a bear cub; the Hailstones gather resources for themselves and their neighbors; Sue has a long list to complete.

Hannah goes behind the scenes to look at the technology behind the lift; along the way, she finds out how coal mines made lifts safer, gets to grips with a piece of medieval siege technology and discovers how a PR stunt changed the modern skyline.

In the remote reaches of Asia's frozen north, creatures must overcome unique challenges, finding exceptional ways to thrive in a hostile world that pushes life to its very limits.

Gators, tortoises and stunning seabirds of southwest Florida.

Exploring an unmapped volcanic underworld in search of the longest lava tube in Arabia.

A hundred days without sunlight approach; Glenn needs to retrieve more wood for heat; Andy and Kate rescue a bear cub; the Hailstones gather resources for themselves and their neighbors; Sue has a long list to complete.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

In the aftermath of a devastating bushfire season, Zac and Darin learn about efforts to rehabilitate the wildlife and livestock population.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

In the aftermath of a devastating bushfire season, Zac and Darin learn about efforts to rehabilitate the wildlife and livestock population.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

A hundred days without sunlight approach; Glenn needs to retrieve more wood for heat; Andy and Kate rescue a bear cub; the Hailstones gather resources for themselves and their neighbors; Sue has a long list to complete.

Hannah goes behind the scenes to look at the technology behind the lift; along the way, she finds out how coal mines made lifts safer, gets to grips with a piece of medieval siege technology and discovers how a PR stunt changed the modern skyline.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

A hundred days without sunlight approach; Glenn needs to retrieve more wood for heat; Andy and Kate rescue a bear cub; the Hailstones gather resources for themselves and their neighbors; Sue has a long list to complete.

Hope and Barry travel to Texas where not everyone agrees on how to help wildlife.

An enormous fiery vortex in Redding, California, the island nation of Malta loses a natural treasure, a mysterious radioactive hotspot is discovered near Chernobyl, and an unknown force lays waste to a mountain forest in Italian Alps.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

Hope and Barry travel to Texas where not everyone agrees on how to help wildlife.

An enormous fiery vortex in Redding, California, the island nation of Malta loses a natural treasure, a mysterious radioactive hotspot is discovered near Chernobyl, and an unknown force lays waste to a mountain forest in Italian Alps.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

Hope and Barry travel to Texas where not everyone agrees on how to help wildlife.

Dark winter brings new challenges in sub-zero temperatures; Andy maintains snow-covered trails; Sue fixes her generator; the Hailstones build a new teepee; Erik takes his wife hunting.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

In the aftermath of a devastating bushfire season, Zac and Darin learn about efforts to rehabilitate the wildlife and livestock population.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

Dark winter brings new challenges in sub-zero temperatures; Andy maintains snow-covered trails; Sue fixes her generator; the Hailstones build a new teepee; Erik takes his wife hunting.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

A race to find the planet's 60 deadliest creatures.

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

A race to find the planet's 60 deadliest creatures.

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.