Christa McAuliffe was the teacher in the seven member crew. That tragedy happened three years before my time (I was born in 1989). And it wasn't the last space disaster; Challenger's older sister, Columbia, burned up and disintegrated in 2003, 17 years after Challenger. Just as in Challenger, all seven Columbia astronauts also died. And the space shuttle is a very risky (and costly) vehicle. It poses a risk of one death for every 8 flights, and each mission costs $500 MILLION each!
Today is the day. We must remember them. They touched our lives. They wished to serve our country in our conquest of space, and they did.
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