Fixed orbit

objects.h

@@ -3,12 +3,13 @@
 #include "vec_utils.h"
 
 typedef struct {
-  float mass;
-  float radius;
-  Vector2 position;
-  Vector2 speed;
+  float mass; // Earth masses.
+  float radius; // Earth radii (physical collision radius).
+  Vector2 position; // Earth radii.
+  Vector2 speed; // Earth radii per simulated second.
   float draw_radius;
-  float charge;
+  float charge; // Coulombs.
+  char name[32];
 } mass_body_t;
 
 typedef struct universe {