BBC Earth

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.

Brian takes a fresh look at the astonishing concept of gravity.

Brian explores one of the greatest mysteries in physics: time.

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.

Brian takes a fresh look at the astonishing concept of gravity.

Brian explores one of the greatest mysteries in physics: time.

Brian Cox explores the fundamental properties of light; the secrets of the cosmos.

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.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

Examine mysterious holes in Israel; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

In the heart of central Mexico, lies Sierra Gorda, a region that is home to bobcats, pumas and flying squirrels.

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

Examine mysterious holes in Israel; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

In the heart of central Mexico, lies Sierra Gorda, a region that is home to bobcats, pumas and flying squirrels.

Professor Brian Cox explores how the universe began and how it will end.

Fifty years since the last moon landing, Associate Professor Alan Duffy talks about the new space race, where innovators and big dreamers are rewriting the rule book on space exploration.

Scientists search for the smallest thing in our universe.

Professor Brian Cox explores how the universe began and how it will end.

Fifty years since the last moon landing, Associate Professor Alan Duffy talks about the new space race, where innovators and big dreamers are rewriting the rule book on space exploration.

Scientists search for the smallest thing in our universe.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

A glimpse into an African waterhole's bustling nightlife where summer's heat changes animals' drinking and cooling-off patterns and a new predator is drawn by increased nocturnal activity.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

A glimpse into an African waterhole's bustling nightlife where summer's heat changes animals' drinking and cooling-off patterns and a new predator is drawn by increased nocturnal activity.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

A glimpse into an African waterhole's bustling nightlife where summer's heat changes animals' drinking and cooling-off patterns and a new predator is drawn by increased nocturnal activity.

Examine mysterious holes in Israel; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

When a tiny piece of trash ruins a raccoon's life, Doctor Jessica cuts it free, but Hope faces tough decisions about its future; a volunteer plunges in to save an injured goose.

Investigate an abandoned village in the shifting sands on Dubai's outskirts and a collection of inexplicable stone circles in Colombia; a mysterious hilltop tower in Iran and a puzzling purple phenomenon in Chile's Atacama Desert.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

When a tiny piece of trash ruins a raccoon's life, Doctor Jessica cuts it free, but Hope faces tough decisions about its future; a volunteer plunges in to save an injured goose.

Investigate an abandoned village in the shifting sands on Dubai's outskirts and a collection of inexplicable stone circles in Colombia; a mysterious hilltop tower in Iran and a puzzling purple phenomenon in Chile's Atacama Desert.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

Wandering in the spaces between and beyond the planets, where countless worlds exist without any light at all; peeking inside hidden realms that stretch halfway to the nearest star and find out what lies outside the reaches of the most powerful telescopes.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

Battle your way through Earth's second-greatest rainforest; follow Simon across 500 miles of dense tropical jungle full of biting insects and peat bogs to reach the Salonga region; enjoy an emotional encounter with a group of wild bonobos.

Simon travels from the Arctic islands of Svalbard to the icy wilderness of Lapland.

From a baby whale in danger to marine iguanas battling storms, a look at how animals survive when faced with challenges of the ocean.

Ken O'Sullivan explores the dark ocean waters to the north of Ireland in winter time, encountering monstrous winter storms of the high latitudes.

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.

From a baby whale in danger to marine iguanas battling storms, a look at how animals survive when faced with challenges of the ocean.

Ken O'Sullivan explores the dark ocean waters to the north of Ireland in winter time, encountering monstrous winter storms of the high latitudes.

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.

From a baby whale in danger to marine iguanas battling storms, a look at how animals survive when faced with challenges of the ocean.

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

Battle your way through Earth's second-greatest rainforest; follow Simon across 500 miles of dense tropical jungle full of biting insects and peat bogs to reach the Salonga region; enjoy an emotional encounter with a group of wild bonobos.

Simon travels from the Arctic islands of Svalbard to the icy wilderness of Lapland.

When a tiny fawn gets hit by a car, Doctor Jessica must splint its broken leg, or it will never return to the wild; a mother porcupine arrives with baby in tow and both need life-saving attention for a parasitic infection.

Come across a set of disturbingly familiar stone monoliths in Colombia, then explore a lost city in the Sierra Nevada de Santa Marta; puzzle over an ancient ruin in Corinth, Greece, and explore an old structure on a Maltese island.

The mystery of where water comes from or how it arrived on Earth.

When a tiny fawn gets hit by a car, Doctor Jessica must splint its broken leg, or it will never return to the wild; a mother porcupine arrives with baby in tow and both need life-saving attention for a parasitic infection.

Come across a set of disturbingly familiar stone monoliths in Colombia, then explore a lost city in the Sierra Nevada de Santa Marta; puzzle over an ancient ruin in Corinth, Greece, and explore an old structure on a Maltese island.

The mystery of where water comes from or how it arrived on Earth.

The remarkable story of how the Hubble Space Telescope has revealed the awe and wonder of our universe.

Investigate what may happen if Earth's current population of 7.7 billion balloons to the 10 billion predicted for 2050; look at the effect that falling birth rates, aging populations, and out-of-control consumption are having on the planet.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Scientists are using technology to research weather on other planets.

Scientists search for the smallest thing in our universe.

The remarkable story of how the Hubble Space Telescope has revealed the awe and wonder of our universe.

Ken O'Sullivan explores the dark ocean waters to the north of Ireland in winter time, encountering monstrous winter storms of the high latitudes.

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.

In the forests of western Madagascar, a small chameleon emerges from the nest; her urge is to climb and reach the high branches where she can hide amongst the leaves.

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

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

In the forests of western Madagascar, a small chameleon emerges from the nest; her urge is to climb and reach the high branches where she can hide amongst the leaves.

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