Spanning 25 miles in diameter, this crater is three times the size of the Grand Canyon, making it the largest known impact site in the U.S. and the 15th largest on Earth.

Each year, millions of travelers are drawn to Grand Canyon National Park. Even though it’s widely photographed, nothing compares to seeing this natural wonder of the world in person. Its sheer ...

Lowell Observatory Historian Kevin Schindler runs a detective story at the Grand Canyon to recreate a famous photo of Neil ...

In comparison, the Grand Canyon is 277 miles long (446 km) and is, at most, about 1.2 miles deep ... because the crater formed when the Moon was very young and several massive impacts followed, ...

From river rafting to the Grand Canyon Skywalk, ... According to the National Park Service, about 90% of Grand Canyon travelers visit the South Rim compared to the seasonal North Rim.

Jutting off in straight lines from a massive crater like two bilby ears near the Moon's South Pole, is a pair of valleys similar to the Grand Canyon in size. But while the Grand Canyon was etched ...