It’s not unusual for optical illusions to create afterimages, ghostly reflections that show up after staring at something too long. This particular afterimage is a bit different. For one thing, it ...

The spiral made by venting fuel from a SpaceX Falcon 9 booster, as seen from Hawaii. It wasn’t aliens or out-of-season fireworks. Instead, the eerie flying spiral light spotted by the Japanese Subaru ...