Simple 2D universe

Movement: WASD OR ↑←↓→.View properties and state of the object: LMBThrow an object: RMBSwitch to nearest object: TABEnable/Disable music: BackspaceReload scene: F2View luminosity: F3Radius and luminosity are not realistic for better graphics. White hole added just for fun.Metals: % of elements heavier than helium.Metallicity: https://en.wikipedia.org/wiki/Metallicity, 0 = Sun type, interval from -6 to +6.