In 1969, Apollo 10 astronauts set the fastest human speed record in space — here's why it still hasn't been broken

Nearly six decades after three NASA astronauts raced home from the Moon at almost 40,000 km/h, no human space mission has surpassed their speed. The crew of Apollo 10—Thomas Stafford, John Young, and Eugene Cernan—still holds the record for the fastest journey ever completed by astronauts, a milestone achieved during their return from lunar orbit on May 26, 1969.

The record was set during Apollo 10, the final dress rehearsal for the historic Apollo 11 Moon landing. Despite major advances in space technology since then, no crewed mission has traveled far enough from Earth to challenge the speed reached during Apollo 10's return.

Apollo 10's record-breaking return to Earth

Apollo 10 launched on May 18, 1969, with the objective of testing every major aspect of a lunar landing mission except the actual touchdown on the Moon. The mission played a crucial role in preparing NASA for Apollo 11's successful lunar landing just two months later.


During the mission, Stafford and Cernan entered the lunar module Snoopy, while Young remained aboard the command module Charlie Brown. Snoopy descended to within approximately 14.4 kilometers of the Moon's surface over the Sea of Tranquillity, allowing the astronauts to photograph the landing site, test navigation systems, and gather vital data for the upcoming Apollo 11 mission.

The mission also faced a tense moment when an incorrectly configured switch caused the lunar module to rotate unexpectedly during ascent preparations. The astronauts quickly regained control, demonstrating the precision required for lunar operations.

How fast did Apollo 10 travel?

After departing lunar orbit, Apollo 10 followed a free-return trajectory, allowing Earth's gravity to accelerate the spacecraft on its journey home.

As the command module reached the edge of Earth's atmosphere on May 26, 1969, it was traveling at approximately 39,938 kilometers per hour (around 36,397 feet per second). According to Guinness World Records, this remains the fastest speed ever recorded by a vehicle carrying human beings.

NASA's published figures differ slightly, listing a peak speed of around 39,897 km/h, with the variation resulting from different conversion and rounding methods.

Why no human has gone faster since 1969

Apollo 10's record is largely a result of orbital mechanics. A spacecraft returning from the Moon carries enormous gravitational energy, which converts into tremendous speed as Earth's gravity pulls it back. Managing that energy safely during atmospheric re-entry is one of the biggest engineering challenges of lunar missions.

Every crewed Apollo mission returning from the Moon experienced extremely high re-entry speeds, but Apollo 10 recorded the highest officially recognized figure.

Since Apollo 17 in 1972, no astronauts have traveled beyond low Earth orbit. As a result, modern human spaceflight has not produced the conditions needed to exceed Apollo 10's speed.

For comparison, astronauts aboard the International Space Station (ISS) orbit Earth at approximately 27,600 km/h, significantly slower than spacecraft returning from lunar distance.

Robotic spacecraft have gone much faster

Although Apollo 10 remains the fastest human mission, robotic spacecraft have achieved far greater velocities.

NASA's Parker Solar Probe, for example, has exceeded 690,000 km/h relative to the Sun, making it the fastest human-made object ever. However, it carries no crew, so it does not challenge Apollo 10's record for human spaceflight.

Could NASA's Artemis missions break the record?

NASA's Artemis program aims to return astronauts to the Moon using the Orion spacecraft, which is designed to withstand high-speed lunar re-entry.

The uncrewed Artemis I mission in 2022 re-entered Earth's atmosphere at roughly 39,400 km/h, demonstrating Orion's capability for future lunar missions. Depending on mission profiles and return trajectories, upcoming crewed Artemis flights could potentially match or even surpass Apollo 10's long-standing speed record.

Apollo 10's lasting legacy

Beyond its speed record, Apollo 10 remains one of NASA's most significant missions. By successfully validating lunar landing procedures, spacecraft systems, and navigation techniques, it paved the way for Apollo 11's historic Moon landing.

The crew also went on to achieve notable milestones in space exploration. Thomas Stafford later commanded the Apollo-Soyuz Test Project, John Young flew six space missions and commanded the first Space Shuttle flight, while Eugene Cernan became the last human to walk on the Moon during Apollo 17.

More than 57 years after its historic return from the Moon, Apollo 10 continues to hold the title of the fastest human spaceflight ever recorded—a record that has remained untouched through generations of space exploration.