Very cool. Some small criticism/feedback:<p>- Pluto is shown as if it is spinning around itself, but in reality Charon (its largest moon) is so heavy (12.2% of Pluto) that their barycentre (<a href="https://en.wikipedia.org/wiki/Barycenter_(astronomy)" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Barycenter_(astronomy)</a>) is actually outside of Pluto's surface.<p>- All the planets and moons are shown as perfectly spherical, but for the smaller ones (e.g. Charon) that's not accurate. Not sure if there is a practical way to fix this though.<p>- Zooming using the scrollwheel is backwards -- rolling the scroll wheel up zooms out, but in all other applications on my system it zooms in.<p>- The panels are very annoying. They can be hidden by unticking in the top right corner, but they still come back on mouseover (getting in the way when trying to click on a planet). I can't find a way to completely close them; they can be moved around, but they refuse to go offscreen. "Options > GUI Size> Small" helps a little.