This Saturday will be the 20th anniversary of the Challenger tragedy, the day when the space shuttle exploded and NASA lost seven astronauts: Francis R. (Dick) Scobee, Michael J. Smith, Judith A. Resnik, Ronald E. McNair, Ellison S. Onizuka, Gregory B. Jarvis, and Christa McAuliffe. Their sacrifice is memorialized at Arlington National Cemetary.

For the people of my generation, the Challenger tragedy was our equivalent of the Kennedy assassination. Because a schoolteacher, McAuliffe, was on board, many schools had chosen to show the launch live to their students over television. The launch took place around 11:30 AM EST, and seventy-three seconds into the flight, the shuttle exploded. People were confused at first, but it soon became clear that NASA was experiencing what they euphemistically refer to as an LOCV: loss of crew and vehicle.

I didn't see the explosion live, but I still remember that day vividly. My own story is as follows. I was in 11th grade at the time at Hunter College High School. One of our school's Chemistry teachers, Francine Salzman, had applied for the Teacher-in-Space program but not been accepted. So we were all keenly aware of the meaning of the launch.

The school's lunch period took place from 11:10 AM to 12noon, if I remember correctly, and after eating lunch I went to hang out in the school library with friends. I was sitting in the front area of the library when my friend Christina Sormani walked in and asked if I had heard the news about the shuttle. I said no, and she told me that it had blown up during the launch. I protested that she was kidding, and she assured me that she wasn't.

I realized she was serious and I started to cry. I cried so much that Tina thought I personally knew one of the astronauts. I didn't, of course; at the time, like all of us, the only one I could actually name was McAuliffe. But I was crying for them nevertheless, and for the dashed hopes and dreams of an entire human race that yearns to go to the stars. I knew that this would cause a major setback in our space program; and I could only hope that it wouldn't crush it entirely.

That afternoon, when we got home, there was an ironic coda. My father had been applying to the Journalist-in-Space program, and on that very day we received the postcard from NASA indicating that all his applications materials were in. And years later, in 2003, McAuliffe and my father were my own inspirations as I applied unsuccessfully to be an Educator Astronaut.

This weekend, I see from searching the web that people have not forgotten. The Challenger Center for Space Science Education has spent years educating children about space; I myself once took a class to the McAuliffe Challenger Center in Framingham. Astronaut Mike Mullane shares his story in USA Today. Filmmakers Renee Sotile and Mary Jo Godges have made the film Christa McAuliffe: Reach for the Stars. The Washington Post has apparently reprinted an article on the final report of the commission that investigated the tragedy.

I know it's two days early, but anniversaries pass so quickly -- the day comes, and then it's gone. So if people would like to share their own personal remembrances of the tragedy, it would serve as a fitting early memorial.

Tags: history, movies, personal, science, space, teaching, world-news