NASA Photo ID: AS16-123-19650
Date Taken: 04/21/72

Description: The geocorona, a halo of low density hydrogen around the Earth (center) photographed by Astronaut John W. Young, Apollo 16 commander, with UV camera. Sunlight is shining from the left, and the geocorona is bright on that side. Exposure 15 secones, with F/1 electronicgraphic camera. The streaks and circular patch on right are instrumental.