Actually, one of the best ways to spot stuff is by “blink comparison” in which you look at photos of the same spot in the sky taken at different times. Things that move relative to Earth show up in different spots on the two photos. As you flip back and forth, those things appear to blink, hence the name.
Actually, one of the best ways to spot stuff is by “blink comparison” in which you look at photos of the same spot in the sky taken at different times. Things that move relative to Earth show up in different spots on the two photos. As you flip back and forth, those things appear to blink, hence the name.