As part of NASA’s Teachers in Space program, payload specialist Sharon Christa McAuliffe is briefed on launch/entry helmets at NASA’s Johnson Space Center’s crew systems lab in Houston on Sept. 12, 1985. McAuliffe, a parishioner and catechist at St. Peter Parish in Concord, New Hampshire, was one of the seven crew members who died in the STS-51L space shuttle Challenger accident, Jan. 28, 1986. (NASA photo)TOMBALL — A Tomball Catholic school science teacher said the Challenger disaster remains one of the most defining moments of her early understanding of science and human exploration, shaping both her worldview and her vocation as an educator.