Driving on the Moon: The Story of Apollo 15

On July 26, 1971, a giant Saturn V rocket roared into the morning sky above Florida. Inside the Apollo 15 spacecraft were three American astronauts: Commander David Scott, Command Module Pilot Alfred Worden, and Lunar Module Pilot James Irwin. While earlier missions like Apollo 11 had focused on proving that humans could safely land on the Moon, Apollo 15 had a different primary goal. This mission was designed for deep scientific exploration. To help the crew explore more area than ever before, NASA engineers had built a brand-new machine: the Lunar Roving Vehicle, or LRV.

The Lunar Roving Vehicle was often called the "Moon buggy." It looked a bit like a stripped-down dune buggy, but it was a marvel of modern engineering. Because space inside the spacecraft was extremely limited, the rover had to be folded up like a piece of lawn furniture to fit inside a compartment on the side of the lunar landing module, named Falcon. Once unfolded on the Moon, the rover measured about ten feet long and six feet wide. It was powered by electric batteries and had a small electric motor built into each of its four wheels. Its tires were not made of rubber, which would get brittle and crack in the extreme temperatures of space. Instead, they were constructed from woven steel wire with metal treads for grip on the soft lunar dust.

On July 31, 1971, astronauts David Scott and James Irwin made history when they took the LRV out for its very first drive on the lunar surface. As Alfred Worden orbited high above in the command module Endeavour, Scott and Irwin navigated the dusty terrain near a deep canyon called Hadley Rille and the giant peaks of the Apennine Mountains. Driving the rover was an unforgettable experience. The vehicle could travel at a top speed of about eight to ten miles per hour. Because the Moon has only one-sixth of Earth's gravity, the rover tended to bounce gently over small rocks and craters. Commander Scott remarked that driving it was like steering a fast boat over choppy water.

The addition of the rover completely transformed lunar science. On foot, astronauts could only walk a short distance from their lander before running low on oxygen and cooling water in their spacesuits. With the LRV, Scott and Irwin traveled over seventeen miles during their three days on the Moon. They visited vast craters, gathered dozens of rock samples, and carried heavy scientific equipment across the surface. One of their most famous finds was the "Genesis Rock," an ancient piece of the Moon's crust that scientists estimated was over four billion years old.

When Apollo 15 concluded on August 7, 1971, the astronauts returned safely to Earth, leaving the faithful Lunar Roving Vehicle behind on the Moon's dusty plains. The mission was declared a resounding success, proving that vehicles could operate effectively in the harsh environment of space. Today, the Apollo 15 rover remains parked near Hadley Rille, a quiet reminder of one of the most exciting achievements in human exploration.