Reason to use the other file: "A PNG version of this file is now available."
Summary
Exactly the same as Image:Kepler-solar-system-2.png except the background has been removed and it is in GIF format so that even old browsers can support the transparency. This should be used only as a template icon, otherwise use the PNG file.
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.