Elon Musk’s rocket company SpaceX has enrolled its first passenger for a trip around the moon. When the trip goes ahead, it will be the first time someone has traveled as far as the moon since NASA’s Apollo missions in the late ’60s and early ’70s, and also the furthest into space that a private passenger has ever traveled.
The company tweeted that the mystery citizen’s identity will be revealed on Monday at 9 p.m. ET.

The announcement is a giant leap toward commercial space travel, with SpaceX, Richard Branson’s Virgin Galactic, and Amazon’s Jeff Bezos all pursuing the goal of commercial space flight.

Musk responded to questions from Twitter users following the announcement, saying that the rocket is still in development and has been “intentionally” designed to resemble one seen in a classic comic book series, “The Adventures of Tintin.”

If all goes well, this unnamed passenger will be the first person to visit the moon since NASA’s Apollo mission in 1972.

According to SpaceX, only 24 humans have been to the moon in history.