BBC Earth

The Fermi Paradox asks why another civilization has not presented itself.

Examining Landsat 8, the advanced planetary explorer with a 900 million dollar price tag, which is designed to reveal complex and ever-changing details undetectable by the human eye.

Brave the constant wind, rain, and snow that pummels the foot of South America; Cross treacherous ice fields that are losing ground due to climate change, push through the foothills of the Andes, and ride alongside Patagonia's legendary gauchos.

The second leg of Simon's journey takes him from the fjords of Norway to Iceland, the land of fire and ice.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

A look at Isaac Newton;a visit to CERN.

Discover the building blocks of life locked inside an ancient asteroid. Travel to the fiery and icy volcanoes of our solar system, then scan the skies for Earth-like exoplanets orbiting distant stars that might harbour extraterrestrial life.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

A look at Isaac Newton;a visit to CERN.

Discover the building blocks of life locked inside an ancient asteroid. Travel to the fiery and icy volcanoes of our solar system, then scan the skies for Earth-like exoplanets orbiting distant stars that might harbour extraterrestrial life.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

A look at Isaac Newton;a visit to CERN.

A photographer snaps into action to save a turkey vulture's life after it gets trapped under a seal carcass.

The view from above reveals baffling behavior from one of the ocean's fastest fish; whales with a strange, aquatic accessorizing habit; a confounding congregation of sharks down under; a perplexing collection of circles decorating the seabed.

When a worldwide pandemic cripples the rehab, wildlife emergencies keep coming in: a bobcat that's been shot, and a massive adult seal; Hope's down to a skeleton crew as critical team members go into quarantine.

Encounter abandoned pods that may have been designed by alien architects; explore a mysterious concrete channel in Bosnia; weave through a complex of odd shapes in Greenland; meet the mythical guardian of a Vietnamese building.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

When a worldwide pandemic cripples the rehab, wildlife emergencies keep coming in: a bobcat that's been shot, and a massive adult seal; Hope's down to a skeleton crew as critical team members go into quarantine.

Encounter abandoned pods that may have been designed by alien architects; explore a mysterious concrete channel in Bosnia; weave through a complex of odd shapes in Greenland; meet the mythical guardian of a Vietnamese building.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

When a worldwide pandemic cripples the rehab, wildlife emergencies keep coming in: a bobcat that's been shot, and a massive adult seal; Hope's down to a skeleton crew as critical team members go into quarantine.

Simon looks back on some of the most dangerous situations he's experienced.

Brave the constant wind, rain, and snow that pummels the foot of South America; Cross treacherous ice fields that are losing ground due to climate change, push through the foothills of the Andes, and ride alongside Patagonia's legendary gauchos.

The second leg of Simon's journey takes him from the fjords of Norway to Iceland, the land of fire and ice.

Discover the building blocks of life locked inside an ancient asteroid. Travel to the fiery and icy volcanoes of our solar system, then scan the skies for Earth-like exoplanets orbiting distant stars that might harbour extraterrestrial life.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

A look at Isaac Newton;a visit to CERN.

Discover the building blocks of life locked inside an ancient asteroid. Travel to the fiery and icy volcanoes of our solar system, then scan the skies for Earth-like exoplanets orbiting distant stars that might harbour extraterrestrial life.

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

The winter season grows more erratic, and Alaskans are forced to adapt.

Exploring the Moukalaba Doudou National Park in Gabon, in search of an undiscovered population of chimpanzees.

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

The winter season grows more erratic, and Alaskans are forced to adapt.

Exploring the Moukalaba Doudou National Park in Gabon, in search of an undiscovered population of chimpanzees.

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

The winter season grows more erratic, and Alaskans are forced to adapt.

Exploring the Moukalaba Doudou National Park in Gabon, in search of an undiscovered population of chimpanzees.

Encounter abandoned pods that may have been designed by alien architects; explore a mysterious concrete channel in Bosnia; weave through a complex of odd shapes in Greenland; meet the mythical guardian of a Vietnamese building.

Hope releases the last of her deer herd as spring approaches, but one fawn doesn't want to leave.

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 Cassini-Huygens spacecraft has been sending images and a wealth of scientific revelations from Saturn's orbit since 2004.

Hope releases the last of her deer herd as spring approaches, but one fawn doesn't want to leave.

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 Cassini-Huygens spacecraft has been sending images and a wealth of scientific revelations from Saturn's orbit since 2004.

Hope releases the last of her deer herd as spring approaches, but one fawn doesn't want to leave.

Dara Ó Briain investigates the darker side of the sun and the invisible harm that the sun can do to us.

Venus offers a complex story with its thick atmosphere and a substantial amount of matter.

Earth's closest neighbor, the moon, is the cosmic stepping stone to a future with the planets.

Searching for ways to minimize their carbon footprints, Zac and Darin visit a self-sustaining home and other business innovating to reduce waste.

Finding relief as Paddy discovers the keys to making healing analgesic tablets and soothing throat lozenges at the Reckitt factory in Nottingham; discovering how mercury thermometers are crafted with Cherry, then examining dodgy Victorian meds with Ruth.

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

The winter season grows more erratic, and Alaskans are forced to adapt.

Exploring the Moukalaba Doudou National Park in Gabon, in search of an undiscovered population of chimpanzees.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Life-giving rains turn the waterhole into a lush oasis; a look at new births among the herbivores, how predators cope with this seasonal change and how population increases transform the site's dynamic.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Life-giving rains turn the waterhole into a lush oasis; a look at new births among the herbivores, how predators cope with this seasonal change and how population increases transform the site's dynamic.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Life-giving rains turn the waterhole into a lush oasis; a look at new births among the herbivores, how predators cope with this seasonal change and how population increases transform the site's dynamic.

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.

Hope prepares for her fundraiser but the spring baby boom starts early; youngest owl; American icon.

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

The jungle, underwater caves and lush everglades of the Yucatán shelter Mexico's largest predator, Morelet's crocodile.

Hope prepares for her fundraiser but the spring baby boom starts early; youngest owl; American icon.

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

The jungle, underwater caves and lush everglades of the Yucatán shelter Mexico's largest predator, Morelet's crocodile.

Hope prepares for her fundraiser but the spring baby boom starts early; youngest owl; American icon.

The winter season grows more erratic, and Alaskans are forced to adapt.

Simon looks back on some of the most dangerous situations he's experienced.

Brave the constant wind, rain, and snow that pummels the foot of South America; Cross treacherous ice fields that are losing ground due to climate change, push through the foothills of the Andes, and ride alongside Patagonia's legendary gauchos.

The second leg of Simon's journey takes him from the fjords of Norway to Iceland, the land of fire and ice.

Simon looks back on some of the most dangerous situations he's experienced.

Brave the constant wind, rain, and snow that pummels the foot of South America; Cross treacherous ice fields that are losing ground due to climate change, push through the foothills of the Andes, and ride alongside Patagonia's legendary gauchos.

The second leg of Simon's journey takes him from the fjords of Norway to Iceland, the land of fire and ice.

Spy creatures reveal an ocean full of intelligence and ways of thinking, including large-brained whales, smart octopi, diving monkeys, creative fish and other intelligent animals.

Ken O'Sullivan explores the marine life of the northern part of the ocean, beginning with the dark waters off the coast of the north of Ireland in winter and the strange animals that can be found there.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean, but the authorities give him just 45 days to finish.

Spy creatures reveal an ocean full of intelligence and ways of thinking, including large-brained whales, smart octopi, diving monkeys, creative fish and other intelligent animals.

Ken O'Sullivan explores the marine life of the northern part of the ocean, beginning with the dark waters off the coast of the north of Ireland in winter and the strange animals that can be found there.