Sunbeams illuminate flowers placed at the Space Mirror Memorial Wednesday, Jan. 28, 2015 as NASA's Kennedy Space Center in Florida pays tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA astronauts who lost their lives while furthering the cause of exploration and discovery, during the agency's Day of Remembrance on Wednesday. (AP Photo/Orlando Sentinel-Red Huber)

29th anniversary of Challenger explosion

CONCORD, N.H. (AP) — Wednesday marks the 29th anniversary of the explosion of the space shuttle Challenger, which killed all seven crew memb…