The crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other fallen astronauts who lost their lives in the name of space exploration and discovery, are honored by NASA Kennedy Space Center employees and guests with a ceremony at the Kennedy Visitor Complex’s Space Mirror Memorial on Jan. 28, 2021. The date marked the 35th anniversary of the Challenger tragedy. NASA centers throughout the country participate in the agency’s annual Day of Remembrance memorial event.