This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
This is a modification of Image:Terr sizes.jpg for just Mercury and Earth comparisons. See image description for that image to find source information.
Approximate scale is 29 km/px.
Public domainPublic domainfalsefalse
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]