Diving Back To The Bottom Of The Mariana Trench

Robert Siegel talks to retired Navy Captain Don Walsh about the attempt by movie director James Cameron to take a submersible capsule to the bottom of the Mariana Trench — the deepest spot on Earth. Walsh says the National Geographic and James Cameron expedition will be a combination of science and adventure, because Cameron is a storyteller and dedicated amateur explorer. Walsh made a 1960 dive to the same trench.

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Meteorite Hunter Scours The Ground For Bits Of Sky

Every so often, pieces of heaven crash into Earth, and Ruben Garcia is looking for them. Aboard his trusty Jeep, the meteorite hunter rides the Arizona landscape, searching for space rocks with a magnetic golf club.

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John Glenn On 50 Years Since His First Orbit

Monday marks the 50th anniversary of astronaut John Glenn’s orbiting of Earth. Glenn — who was one of NASA’s original Mercury Seven — was the first American to achieve the feat. He flew the mission in just under five hours, circling the globe three times in a capsule named Friendship 7. Glenn, who says he recalls the mission as if it were just last week, tells Audie Cornish he doesn’t want the US to lose sight of the future and America’s role in outer space.

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Next Supercontinent Could Form At The North Pole

Several times in earth’s history continents have collided to form supercontinents only to later break apart. Geologist Ross Mitchell discusses a new study in Nature that predicts in 50 to 200 million years time the Americas and Eurasia will collide to form a supercontinent over the Arctic.

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