Now I learned a couple of things from this one photograph. Its a fascinating practical example of things we all should know if we really thought it all through. Can you guess what is shown in this photo? What is the plume extending upward from the ground? Why is the top of the plume brighter than its bottom? What is the bright object in the lower righthand corner of the picture, and what is the dark, cone-shaped feature that seems to be leaving the plume and converging on the bright object? Examine the picture carefully, look at the high-resolution version if you want to, and see if you can figure out the answers to these questions. Then, read the caption below to test yourself.

Smoke Plume

Explanation and original posting on NASA website.