File:Borrelly Jets.jpg

This is a composite of images acquired by NASA's Deep Space 1 spacecraft, showing some of the features in comet Borrelly's coma, dust jets, and nucleus. The range to the comet in this view is about 4800 kilometers (3000 miles). Borrelly's nucleus is about 8 kilometers (5 miles) end-to-end so the field of view is about 40 kilometers (25 miles) on each side. The Sun shines from the bottom of the image (solar phase angle is about 65 degrees). The direction of the main dust jet (seen extending to the bottom left) is about 30 degrees from the Sun line. The colors show about three orders of magnitude in brightness (the purple about 1/1000, blue about 1/100, and red about 1/10 the brightness of the nucleus). The red bumps near the nucleus are real, showing where the main jet resolves into three distinct narrow jets that likely come from discrete surface sources.

Taken without permission from http://nmp.jpl.nasa.gov/ds1/borrelly_1002.html