Previously, I wrote: “In the second grade, I got an assignment to write a report about the planet Jupiter. I expanded it into an entire ‘book,’ Dees’s Book of the Solar System. Of course, I copied almost everything from the Junior Britannica entry on the Solar System, but I suppose it was impressive for a second grader.

“Anyway, from about 1970 to 1974 [my mother] took me to the planetarium at San Antonio College nearly once a month (these days, it’s the Scobee Planetarium, named after the commander of the last flight of Challenger). Instead of a taped presentation, those shows were narrated live — all sorts of space subjects…”

The planetarium is still around, though naturally closed right now. Its web site notes: “Since 1961, two million San Antonio school children and community members have learned about stars, planets, black holes and distant galaxies at the Scobee Planetarium. With the extensive renovation completed in 2014, the Scobee Planetarium now offers a more dynamic experience to even more visitors. Planetarium renovations include 100 individual reclined seats, a new light and sound system and the most advanced digital projection system.”

Fifty years ago, SAC gave me this certificate, acknowledging that I’d gone to eight shows — “lecture-demonstrations,” that is. I still go to planetariums now and then, though the truth is that many shows aren’t just for children, but for not-very-bright children.

At some point, my mother — who also received a certificate — put mine in an inexpensive frame. It hung on the wall in my bedroom in San Antonio until it didn’t. A few years ago, after having forgotten about the certificate for 40-odd years, I chanced on it again. That made me smile, so I brought it back with me and hung it in my current office.