The Crab Nebula Supernova Remnant

This page will allow you to measure distances in this image. You may want to make several measurements across the crab nebula and average them

1. Click on one end of the nebula. The window will display the x,y pixel coordinates you have selected.
2. Click on the opposite end, the window will report the second set of x,y coordinates.
3. Record the angular size as reported.
4. If you make a mistake please click the "Try Again" link