Astronauts Memorial Foundation President and CEO Thad Altman speaks during NASA’s Day of Remembrance ceremony on Thursday, Jan. 23, 2025, inside the Center for Space Education at the Kennedy Space Center Visitor Complex in Florida. The annual event honors the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other astronauts who lost their lives in the pursuit of spaceflight. This year’s ceremony was hosted by the Astronauts Memorial Foundation, which was founded after the shuttle Challenger accident in 1986 to honor the sacrifices of fallen astronauts each year.