Stellarium flybys in high resolution

1. vncserver -geometry 7680x4320

Tightvnc viewer, choose 25% zoom in options

Flybys are possible now!

Board a spacecraft and flyby planets, moons and a comet yourself · Stellarium/stellarium · Discussion #2178 (github.com)

2. Xubuntu with high-res screen : r/xubuntu (reddit.com)
Settings -> Appearance -> Fonts and set to roughly 180.

3. Now stellarium can save screenshots in desired resolution directly, so no need of vnc etc.