On April 19, 2007, the crescent
moon and Venus made a beautiful
pair in the western sky at dusk.
This long exposure image shows
how the pair appears to drift
westward along with the stars—the
result of our own planet's
rotation. The wispy blobs
that appear most prominently
along the moon's path are clouds
that drifted into the picture
and became temporarily
illuminated by moonlight.