Hi, @Lukas. I just found the Notepad and I saw this:
<Motorized>false</Motorized>
<Motor>
<StartPropulsionAt>0.5</StartPropulsionAt>
<PropulsionStrength>0</PropulsionStrength>
<Curvature>0</Curvature>
</Motor>
Is that a reversible movement of stars? I am really don’t know how to do that. BTW, thanks.