Um... Columbia was a couple years ago, Challenger was 20 years ago today.
It was one of the first few shuttle launches I saw, I was 4 at the time and only kinda knew what was going on.
Columbia, however, brought tears to my eyes. I always felt an attachment to it cause it first launched the year I was born.
Rest In Peace, both crews. May you forever explore the Heavens.
ETA: someone linked http://www.prometheus-music.com/audio/fireinthesky.mp3 that at another site.