Time lapse movie featuring the Gemini North laser (part of the Laser Guide Star system) propagating through the sky. The other laser is propagated from the W.M. Keck Observatory. The images from this movie were also used to create a picture of the star trails over Mauna Kea which you can see here. Gemini Observatory Image/Video Usage Policy Medium HD Quicktime Movie (49.7 Mb) Small HD Quicktime Movie (9.1 Mb) iPhone Movie (2.5 Mb) Windows Media Video (1.4 Mb)