Keyword: capture

Observing stars becomes easier if you don't have to constantly make adjustments. This is even more important, if you want to make long-exposure photos of the sky. The solution is simple & elegant -- the Earth rotates around it's axis and if you counteract that rotation, you keep looking at the same position in the sky. There are different names for solutions to do that, most notably an "equatorial mount". Barndoor- and other star-tracking accessories all use the same principle and require the same preparation steps -- THE POLAR ALIGNMENT

Supernovae are among the most powerful events in our universe and they emit unimaginable amounts of energy. And long long time ago, in a galaxy far far away that has happened but it took 11.5 million years and only now does this energy reach us, some of it visible to our eyes. Look up at the sky & search for the M82 "Cigar Galaxy" -- it will be over in a few weeks.