CHICAGO (AP) — Three Apollo astronauts will have their footprints set into concrete next week at Chicago's Adler Planetarium in a ceremony to honor veterans of the program's final mission.

The event on Tuesday will mark the 40th anniversary of the Apollo 17 mission, the 11th and final manned flight to the Moon for NASA's Apollo program.

Apollo 17 astronauts Harrison Schmitt and Capt. Eugene Cernan will be on hand, along with Apollo 13 astronaut Capt. James Lovell, Jr.

Their footprints will be displayed at the planetarium.

Schmitt piloted the lunar module in the December 1972 mission. He and Cernan spent three days on the Moon's surface collecting lunar rocks and evidence of volcanic activity. Cernan is the last man to have walked on the Moon.