A U.S. auction house will soon accept bids on space and aviation artifacts, including an electrocardiogram of Apollo 11 Commander Neil Armstrong’s heartbeat taken when he first set foot on the moon.

Amherst, New Hampshire-based RR Auction will take bids on the EKG, which registered a normal heartbeat, and other artifacts during an online auction from May 16 through May 23.

Other artifacts include the joystick controller operated by Apollo 11 astronauts Buzz Aldrin and Michael Collins in the Apollo 11 command module.

Auction officials say over 85 lots of Apollo 11 material will be featured in the auction.