Thirty-six years after becoming the first American woman to walk in space, Kathy Sullivan has made history yet again. On Sunday, the 68-year-old oceanographer and former NASA astronaut became the ...

Add Yahoo as a preferred source to see more of our stories on Google. Just as Earth’s land surface has enormous peaks and valleys, the oceanic world has similarly varied topography. Perhaps the most ...

Dylan Taylor holding a mission patch for STS-51L, the last mission of Challenger at the bottom of the Challenger Deep. Source: Dylan Taylor Last summer I had a chance to visit one of the most remote ...

The astronaut Kathy Sullivan, 68, is now also the first woman to reach the Challenger Deep, about seven miles below the ocean’s surface. By Heather Murphy The first American woman to walk in space has ...

Just eight people have reached Challenger Deep, the deepest point of the ocean. More than 550 people have visited space. But only one person has done both: Kathy Sullivan. On Sunday, the NASA ...

If you liked this story, share it with other people. On July 12, oceanographer and geographer Dawn Wright was sealed inside a submersible, traveling to Challenger Deep, the deepest part of the Mariana ...

A new video simulates the explosion of thermal nuclear weapons in the Challenger Deep. Tsar Bomba is the most powerful nuclear bomb ever made. One bomb would be stanched, but a million could easily ...

(CNN) — Just as Earth’s land surface has enormous peaks and valleys, the oceanic world has similarly varied topography. Perhaps the most intriguing of these features is the Mariana Trench — a chasm in ...