/usr/share/desktop-directories/Astronomy.directory is in education-menus 1.713+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [Desktop Entry]
Name=Astronomy
Name[es]=AstronomÃa
Icon=edu-astronomy
Type=Directory
|