Can we explore the history of a body? Like a SP§RE timeline? For eg., if you collide, say, Ceres into the Moon and then click "Open History" under "More Info" there will be an icon of a medium sized body colliding with earth and it will say: "[time of collision] Ceres collided with the moon, thus destroying it" or just "[time of collision] Ceres collided with the moon". And there can be a history for the whole simulation. Also stuff like changed water level or changed mass will be recorded.
Ideas for icons:
"Open History" button: Clock showing 4:00, the bigger portion of the clock being filled in.
Collision: Earth and Thea collision
Changed Mass: Wrench with cube next to it.
Changed Volume: Wrench next to X-Y-Z axis
Changed Density: Wrench next to three small cubes in pyramid pattern
Changed Water Level: Wrench next to raindrop
Changed MoltenFactor: Wrench next to erupting volcano
Changed Atmosphere mass: Wrench next to gust of wind
Changed atmosphere color: Paint palette and brush next to a gust of wind
Changed Orbit: Wrench next to a planet orbiting a star
Added body: A + sign
Deleted body: A — sign or a pop sign ( ten lines faced away from each other in a circular configuration)
Exploded body: An exploding planet, like the icon in US 2009
Changed vegetation level (if it will exist): Wrench next to a tree
Changed Axis: Wrench next to Earth with polar axis lines showing and 2 arrows indicating polar reverse
Changed velocity: Wrench next to fading arrow
Planet destroyed by Stellar Expansion/Supernova: Shockwave sweeping away Earth
Stellar Expansion: Sun icon with arrows pointing away from it.
Supernova/Nova: Explosion with arrows pointing away from it.
Changed Composition: Wrench next to a circle that is half-earth, half-pie chart
Changed Rotational period: Wrench next to earth with an arrow going around it
Added ring: + and a ring
Deleted ring: — and a ring
Changed ring: Wrench and ring
Tell me if I missed anything!