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 the ...

We see a boat on the water and a deep ocean trench below it. The deepest depths of the sea are found in the crescent-shaped Mariana Trench, located in the western Pacific Ocean. But what is the ...

This astronaut just successfully reached the lowest point on Earth. Kathy Sullivan soared to new heights when she became the first American woman to walk in space in 1984. On Monday, she broke a new ...

Former NASA astronaut Kathy Sullivan became the first woman to reach Challenger Deep, the deepest point in the ocean. Sullivan was also the first American woman to complete a spacewalk over 36 years ...

Almost three-quarters of our world is covered in saltwater, and, on average, the ocean is about 12,100 feet or 2.3 miles deep. But in certain places, the sea floor plummets to truly astonishing depths ...