diff --git a/src/defs.txt b/src/defs.txt
index b61f6f8..9921b36 100644
--- a/src/defs.txt
+++ b/src/defs.txt
@@ -37,26 +37,26 @@ actor 300000 0 500000 jupiter
     rotationz -0.28
     angularmomentum 30 30 30
 
-actor -300000 0 -300000 io
-    scale 28000
+actor -435000 0 -435000 io
+    scale 10188
     rotationy -0.40
     angularmomentum 0 0.0001 0
     sphere yes
 
-actor -100000 0 400000 europa
-    scale 20000
+actor -900000 200000 1900000 europa
+    scale 8733
     rotationy 0.20
     angularmomentum 0 0.0001 0
     sphere yes
 
-actor 500000 0 -200000 ganymede
-    scale 18000
+actor 2500000 0 -1000000 ganymede
+    scale 14737
     rotationy -0.40
     angularmomentum 0 0.0001 0
     sphere yes
 
-actor -800000 0 300000 callisto
-    scale 8000
+actor -4000000 0 1500000 callisto
+    scale 13484
     rotationy -0.40
     angularmomentum 0 0.0001 0
     sphere yes