/usr/share/applications/screensavers/glplanet.desktop is in xscreensaver-gl-extra 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=GLPlanet
Exec=/usr/lib/xscreensaver/glplanet -root
TryExec=/usr/lib/xscreensaver/glplanet
Comment=Draws a planet bouncing around in space. The built-in image is a map of the earth (extracted from `xearth'), but you can wrap any texture around the sphere, e.g., the planetary textures that come with `ssystem'. Written by David Konerding.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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