Here's a small planet sim that's quite interactive. At first it was planned to be a doodle but it kept growing.
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Controls: [LM] = LEFt Mouse Button [RM] = RIGHT Mouse Button [MM] = MIDDLE Mouse Button [MWU]= Mouse Wheel UP [MWD]= Mouse Wheel DOWN [SH] = (L/R)Shift [CT] = (L/R)Control (CTRL) [SP] = Space //--//--//--//--//--\\ \\C_\\T_\\R_\\L_\\:_// Hold and drag [LM] to create planet. (+[CT] to create frozen) Hold and drag [LM] on planet to drag. (+[SH] to drive planet or set speed when paused) When dragging a planet you can (un-)freeze with +[RM]. Hold and drag [RM] on a planet to create orbiter. (+[SH] to invert initial speed) Hold [MM] to remove all planets. [MWU]/[MWD] to in-/decrease weight. [MWU]/[MWD] + [SH] to in-/decrease travel-time/speed. [MWU]/[MWD] + [CT] to in-/decrease radius. [SP] to un-/pause. [TAB] to toggle info.
Creating an orbiting planet:
Plan crashes when paused:
Driving a planet ([LM] + [SH]):
Dragging and freezing: