BBC Earth

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

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.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

On 2nd August 1932, American physicist Dr Carl Anderson captured the first ever image of antimatter. Antimatter has only ever been glimpsed in fleeting moments because as soon as it comes into contact with matter, both annihilate.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

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.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Paul explores the science behind cryogenic freezing and how it's being used to ensure frozen fish tastes almost as good as fresh; in a gelato factory, Clare gets the scoop on why humans are hard-wired to desire junk food.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Paul explores the science behind cryogenic freezing and how it's being used to ensure frozen fish tastes almost as good as fresh; in a gelato factory, Clare gets the scoop on why humans are hard-wired to desire junk food.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

Get under the skin of ice age megabeasts as Steve tackles a murder mystery in a U.K. cave filled with oversized animal remains; discover the sabre-toothed tiger's strengths and weaknesses with Michaela; see what woolly mammoth DNA has to say.

Steve and Michaela uncover the story of Neanderthals versus Homo sapiens and their struggle to survive.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Emperor penguins cross a dangerous frozen sea to reach their breeding grounds; rockhoppers brave stormy seas and a 300-foot cliff; tropical Humboldt penguins face sea lions and vampire bats as they make their way to their desert nests.

The male penguins hand over their newborns to the returning females.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Something big and brown is headed to "Hope for Wildlife," but this black bear is tied up in red tape.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Shocking new insights into the demise of modern humans' sister species, the Neanderthals, Homo sapiens's possible role in their downfall and how it becomes the last human species on Earth.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison Wood is in Botswana hoping to follow the world's largest elephant migration for 650 miles on foot along ancient pathways, but he first must overcome dangers in the bush before tracking a large herd of female elephants.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison Wood is in Botswana hoping to follow the world's largest elephant migration for 650 miles on foot along ancient pathways, but he first must overcome dangers in the bush before tracking a large herd of female elephants.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

A daring deer rescue is captured on camera.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

A daring deer rescue is captured on camera.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

A daring deer rescue is captured on camera.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison Wood is in Botswana hoping to follow the world's largest elephant migration for 650 miles on foot along ancient pathways, but he first must overcome dangers in the bush before tracking a large herd of female elephants.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison Wood is in Botswana hoping to follow the world's largest elephant migration for 650 miles on foot along ancient pathways, but he first must overcome dangers in the bush before tracking a large herd of female elephants.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

A look at Dr. Savannah's practice and what she's learning about Metis culture.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Four rival families, leopards, hyena, wild dogs and lions, all try to claim a rich corner of Zambian paradise as their home.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

A look at Dr. Savannah's practice and what she's learning about Metis culture.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Exploring fossils from a North Dakota site that may reveal what happened when an asteroid struck Earth and wiped out the dinosaurs.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

Hitting the streets in Canada's biggest city.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

Hitting the streets in Canada's biggest city.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

Hitting the streets in Canada's biggest city.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

A look at Dr. Savannah's practice and what she's learning about Metis culture.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

A look at Dr. Savannah's practice and what she's learning about Metis culture.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Exploring fossils from a North Dakota site that may reveal what happened when an asteroid struck Earth and wiped out the dinosaurs.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

The team travels to every corner of the planet over the course of five years.

When Earth first formed from clouds of dust and gas 4.6 billion years ago, it was devoid of an atmosphere, an inhospitable rock floating in the black void of space.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

The team travels to every corner of the planet over the course of five years.

When Earth first formed from clouds of dust and gas 4.6 billion years ago, it was devoid of an atmosphere, an inhospitable rock floating in the black void of space.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

Hope fights a problem that kills millions of birds each year in Chicago.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

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

Hope fights a problem that kills millions of birds each year in Chicago.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

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

Hope fights a problem that kills millions of birds each year in Chicago.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

The team travels to every corner of the planet over the course of five years.

When Earth first formed from clouds of dust and gas 4.6 billion years ago, it was devoid of an atmosphere, an inhospitable rock floating in the black void of space.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

The team travels to every corner of the planet over the course of five years.

When Earth first formed from clouds of dust and gas 4.6 billion years ago, it was devoid of an atmosphere, an inhospitable rock floating in the black void of space.

Simon revisits the incredible characters he's met during his travels.

Simon Reeve travels through some of the most remote landscapes on Earth in search of the people and the wildlife of the planet's wildernesses.

Simon revisits the incredible characters he's met during his travels.

Simon Reeve travels through some of the most remote landscapes on Earth in search of the people and the wildlife of the planet's wildernesses.