I was trying to take a #photo of #Jupiter a couple of weekends ago for the first time ever, and thought my lens had some junk on it. Today, though, I realized that it didn't actually look like normal refraction, opened up an online chart of the solar system and discovered that, instead, I had photographed the #GalileanMoons. This was a really fun accident, and I learned a few things about exposure and #astrophotography from it!