Here we have a image from Galaxy Zoo of a spiral galaxy with a streak of light next to it. It cause some volunteers confusion on Talk. This streak is a satellite trail, cause by a man-made satellite passing through the field of view while the image was being taken. There are thousands of these satellites orbiting the Earth, so this is a relatively common occurrence. See if you can identify a satellite trail today at www.galaxyzoo.org
Daily Zooniverse 