A series of three images taken of the Crab pulsar and surrounding
region. If you look closely at the images, you will see a couple
of features that change over this time frame. Note especially the
thin white streak a little over one-third from the bottom of the middle
image, and a little over one-fourth from the bottom of the lower right
image. It appears much like a wave in a pond.
A close-up of the Crab Nebula pulsar and a diagram identifying the
features seen. Note that these images have been rotated 90 degrees
clockwise from the above images.