Star trail and LGS from Gemini North

Star trail image of the Gemini laser guide star as it tracks along with the Earth's rotation. This image was made by stacking multiple 50-second exposures over a period of about 15 minutes. The remains of evening twilight can be seen to the right and the lights of Hilo to the left. Thanks to the Canada-France-Hawaii telescope for access to their catwalk for this image.