In the fourth season of “On a Mission” we’ll be transported to the Red Planet with all five of NASA’s Mars rovers.

In the fourth season of “On a Mission” we’ll be transported to the Red Planet with all five of NASA’s Mars rovers.

The Voyager 1 spacecraft has traveled farther away from Earth than any human-made object. Candy Hansen and David Grinspoon talk about the Voyager mission, and its humbling perspective of our planet as a tiny blue dot in the blackness of space.

The Voyager 1 spacecraft has traveled farther away from Earth than any human-made object. Candy Hansen and David Grinspoon talk about the Voyager mission, and its humbling perspective of our planet as a tiny blue dot in the blackness of space.

We hike in the Australian Outback with Abigail Allwood to visit the most ancient fossils on Earth, and track the imprint of life over space and time with David Grinspoon.

We hike in the Australian Outback with Abigail Allwood to visit the most ancient fossils on Earth, and track the imprint of life over space and time with David Grinspoon.

From fires in outer space to raging wildfires on Earth, fire experts Gary Ruff and Natasha Stavros reveal how fingers of flame reach out around our world.

From fires in outer space to raging wildfires on Earth, fire experts Gary Ruff and Natasha Stavros reveal how fingers of flame reach out around our world.

Get swept away as we fly into massive hurricanes, and hear how the rumblings of climate change will cause clouds to gather into ever more powerful storms.

Get swept away as we fly into massive hurricanes, and hear how the rumblings of climate change will cause clouds to gather into ever more powerful storms.

As we fly around with NASA pilots, we’ll explore Earth’s air space with scientists Annmarie Eldering and Armin Sorooshian -- from wispy clouds high above, to tiny particles that make up air pollution.

As we fly around with NASA pilots, we’ll explore Earth’s air space with scientists Annmarie Eldering and Armin Sorooshian -- from wispy clouds high above, to tiny particles that make up air pollution.

Bundle up! We’ll be diving into ice-covered waters with an upside-down robot, and exploring Greenland’s massive ice sheet with oceanographer Josh Willis.

Bundle up! We’ll be diving into ice-covered waters with an upside-down robot, and exploring Greenland’s massive ice sheet with oceanographer Josh Willis.

Dive to the deepest point of the ocean with an astronaut, brave the high seas with an oceanographer, and meander through sparkling rivers with a hydrologist.

Dive to the deepest point of the ocean with an astronaut, brave the high seas with an oceanographer, and meander through sparkling rivers with a hydrologist.

Like waves of the ocean, our planet’s surface is in constant motion. In this episode, we’ll travel to tropical rainforests to dig into soils with an ecologist, and fly drones with an earthquake expert to spot shifts in the ground beneath our feet.

Have you ever wanted to see the awesome spectacle of an erupting volcano? There’s no better guide for such an adventure than JPL volcanologist Rosaly Lopes.

You might think you know Earth, but astronaut’s views from outer space help us see our world in a whole new light.

In season 3, we’ll travel to the ends of the Earth with scientists who explore different aspects of our unique planet.