BBC Earth

A look at how gravity affects the world, and even the solar system.

Mercury, one of the nearest planets to earth, has eluded astronomers' best efforts to learn its secrets until missions like Mariner and Messenger.

Examining how cosmic rays are produced and what that can tell us about the universe.

At the very end of East Africa's Great Rift Valley, there's a "land that time forgot"; the rolling grasslands of the Luangwa Valley.

Alaskans make the most of the endless sun as the last of the snow melts.

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

At the very end of East Africa's Great Rift Valley, there's a "land that time forgot"; the rolling grasslands of the Luangwa Valley.

Alaskans make the most of the endless sun as the last of the snow melts.

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

At the very end of East Africa's Great Rift Valley, there's a "land that time forgot"; the rolling grasslands of the Luangwa Valley.

Alaskans make the most of the endless sun as the last of the snow melts.

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

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

Hope realizes she's not prepared to rescue animals from an oil spill, so she heads across the continent to learn from the best before disaster strikes.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

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.

Hope realizes she's not prepared to rescue animals from an oil spill, so she heads across the continent to learn from the best before disaster strikes.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

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.

Hope realizes she's not prepared to rescue animals from an oil spill, so she heads across the continent to learn from the best before disaster strikes.

Dara tells the story of how the first photograph of the far side of the moon left scientists baffled and tries a virtual reality headset to walk on the moon.

Mercury, one of the nearest planets to earth, has eluded astronomers' best efforts to learn its secrets until missions like Mariner and Messenger.

Examining how cosmic rays are produced and what that can tell us about the universe.

Along the coastline, Zac and Darin take a deep dive into the coral reef restoration techniques supporting a vast underwater ecosystem.

Paddy explores a South Wales factory making Jammie Dodgers, revealing how they produce 4.4 billion biscuits a year; Cherry tests dunking science and Ruth uncovers wartime history.

At the very end of East Africa's Great Rift Valley, there's a "land that time forgot"; the rolling grasslands of the Luangwa Valley.

Alaskans make the most of the endless sun as the last of the snow melts.

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

Coral Reefs are vibrant undersea cities where life has found ways to survive.

The team looks inside a waterhole ecosystem in Mwiba Wildlife Reserve in Tanzania; elephants, Cape buffalo and lions make it a home.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

The team looks inside a waterhole ecosystem in Mwiba Wildlife Reserve in Tanzania; elephants, Cape buffalo and lions make it a home.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

The team looks inside a waterhole ecosystem in Mwiba Wildlife Reserve in Tanzania; elephants, Cape buffalo and lions make it a home.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

A cow winds up at Hope For Wildlife; the spring orphans are all grown up, and Hope has to decide who's ready for release.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicolored pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

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.

A cow winds up at Hope For Wildlife; the spring orphans are all grown up, and Hope has to decide who's ready for release.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicolored pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

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.

A cow winds up at Hope For Wildlife; the spring orphans are all grown up, and Hope has to decide who's ready for release.

Alaskans make the most of the endless sun as the last of the snow melts.

Simon reflects on the modern threats to the world's spectacular wilderness.

Wander through the parched Kalahari Desert in search of wildlife, including one of Africa's largest elephant enclaves; go hunting with a group of San trackers who still live in the traditional way, then encounter the region's famous lions.

Go from Chile's Atacama Desert to the tip of Tierra del Fuego, where Simon wraps up his journey; See the effects of fast fashion waste, the havoc inflation is wreaking on Argentina, and an Indigenous group entangled in a Chilean political crisis.

Simon reflects on the modern threats to the world's spectacular wilderness.

Wander through the parched Kalahari Desert in search of wildlife, including one of Africa's largest elephant enclaves; go hunting with a group of San trackers who still live in the traditional way, then encounter the region's famous lions.

Go from Chile's Atacama Desert to the tip of Tierra del Fuego, where Simon wraps up his journey; See the effects of fast fashion waste, the havoc inflation is wreaking on Argentina, and an Indigenous group entangled in a Chilean political crisis.

Uncovering surprising undersea relationships and connections as sharks befriend fish and whales play with dolphins.

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

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Uncovering surprising undersea relationships and connections as sharks befriend fish and whales play with dolphins.

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

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Uncovering surprising undersea relationships and connections as sharks befriend fish and whales play with dolphins.

Simon reflects on the modern threats to the world's spectacular wilderness.

Wander through the parched Kalahari Desert in search of wildlife, including one of Africa's largest elephant enclaves; go hunting with a group of San trackers who still live in the traditional way, then encounter the region's famous lions.

Go from Chile's Atacama Desert to the tip of Tierra del Fuego, where Simon wraps up his journey; See the effects of fast fashion waste, the havoc inflation is wreaking on Argentina, and an Indigenous group entangled in a Chilean political crisis.

Hope opens her doors to the public.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

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

Hope opens her doors to the public.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

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

Hope opens her doors to the public.

Mercury, one of the nearest planets to earth, has eluded astronomers' best efforts to learn its secrets until missions like Mariner and Messenger.

Examining how cosmic rays are produced and what that can tell us about the universe.

At the very end of East Africa's Great Rift Valley, there's a "land that time forgot"; the rolling grasslands of the Luangwa Valley.

Mercury, one of the nearest planets to earth, has eluded astronomers' best efforts to learn its secrets until missions like Mariner and Messenger.

Examining how cosmic rays are produced and what that can tell us about the universe.

Uncovering surprising undersea relationships and connections as sharks befriend fish and whales play with dolphins.

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

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

In Taiwan, a Formosan pangolin travels through a land of giants to find a mate in a protected forest; in Brazil's Atlantic forest, a family of golden headed lion tamarins travel to the edge of their world and find a strange land of plenty.

Paddy McGuinness and Cherry Healey hit factory floors across Britain for a snoop around their supersized production lines to reveal what the secrets are behind supermarket staples.

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

In Taiwan, a Formosan pangolin travels through a land of giants to find a mate in a protected forest; in Brazil's Atlantic forest, a family of golden headed lion tamarins travel to the edge of their world and find a strange land of plenty.

Paddy McGuinness and Cherry Healey hit factory floors across Britain for a snoop around their supersized production lines to reveal what the secrets are behind supermarket staples.