Sunday, November 18, 2007
This fantastic photo is a 30 second exposure on the night sky in Arizona. The photgrapher was able to capture, far more brighter than usual - Venus, the Moon, and the International Space Station flying through the sky.
The exposure is how much light is allowed in to the camera. The weaker the light source then the longer the exposure. When they took the famous Hubble telescope Deep Field shots, they pointed Hubble at an empty patch of sky, and just left the lens open for a whole day. This is what they were able to see after that much exposure.