BBC Earth

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.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

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.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

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.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

The second-largest planet is also a mini-solar system with 60 moons and those crazy rings.

The Dawn mission explores the asteroid Vesta and dwarf planet Ceres.

The search for water is actually the search for life, and that search is taking man to some unusual places, including a moon of Saturn.

Scientists are now probing to detect gravity waves in space and mapping the gravity patterns of the moon for the first time.

For more than 25 years, the shuttle was our ticket to space and our laboratory in orbit.

The vast majority of information being gathered about Mars is by orbiters chronicling everything they can.

Exploring the Milky Way from the mythology of ancient sky watchers to how scientists are mapping it from the inside out.

Examining the science behind the birth of the universe.

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.

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.