diff --git a/src/world.rs b/src/world.rs
index 4cc67ff..851b2a8 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -7,8 +7,8 @@ use bevy_xpbd_3d::plugins::sync::SyncConfig;
 use std::f32::consts::PI;
 use std::f64::consts::PI as PI64;
 
-const ASTEROID_UPDATE_INTERVAL: f32 = 0.1; // seconds
-const ASTEROID_SIZE: f32 = 100.0;
+const ASTEROID_UPDATE_INTERVAL: f32 = 1.0; // seconds
+const ASTEROID_SIZE: f32 = 5000.0;
 const STARS_MAX_MAGNITUDE: f32 = 5.5;
 
 const CENTER_WORLD_ON_PLAYER: bool = true;
@@ -68,7 +68,6 @@ impl Plugin for WorldPlugin {
 struct AsteroidData {
     entity: Option<Entity>,
     is_spawned: bool,
-    spawned_once: bool,
     class: u8,
     size: f32,
     pos: DVec3,
@@ -173,35 +172,47 @@ pub fn setup(
 fn generate_asteroids(
     mut db: ResMut<AsteroidDatabase>,
 ) {
-    let maxdist = 30;
-    let maxdist_orthogonal = maxdist / 4;
-    let player_r: f64 = 220000e3; // sync this with defs.txt parameters
-    let player_phase: f64 = 0.66; // sync this with defs.txt parameters
-    let player_x: f64 = player_r * (player_phase * PI64 * 2.0).cos();
-    let player_y: f64 = 0.0;
-    let player_z: f64 = player_r * (player_phase * PI64 * 2.0).sin();
-    let offset: f64 = 500.0;
-    let dist: f64 = 8e3;
-    for i in -maxdist..maxdist {
-        for j in -maxdist_orthogonal..maxdist_orthogonal {
-            for k in -maxdist..maxdist {
-                let wobble: f64 = dist/2.0;
-                let (i, j, k) = (i as f64, j as f64, k as f64);
+    let phase_steps: i16 = 600;
+    let radius_steps: i16 = 1000;
+    let max_height_step: i16 = 6; // this one is inclusive for symmetry
+    let min_height_step: i16 = -max_height_step;
+
+    let min_radius: f64 = 92e6;
+    let max_radius: f64 = 229e6;
+    let ring_thickness: f64 = 2.0e6;
+
+    let height_step_factor: f64 = ring_thickness / 2.0 / (max_height_step as f64);
+    let max_phase_step_factor: f64 = 2.0 * PI64 / (phase_steps as f64);
+    let max_radius_factor: f64 = (max_radius - min_radius) / (radius_steps as f64);
+    let wobble: f64 = (ASTEROID_SIZE * 50.0).into();
+    let mut count = 0;
+    for phase_step in 0..phase_steps {
+        let phase = max_phase_step_factor * phase_step as f64;
+        for radius_step in 0..radius_steps {
+            let radius = max_radius_factor * radius_step as f64 + min_radius;
+            for height_step in min_height_step..=max_height_step {
+                let height = height_step_factor * height_step as f64;
+
+                let rand1 = (phase+radius).sin() + (height+radius).cos();
+                let rand2 = (phase+height).sin() + (phase+radius).cos();
+                let rand3 = (radius+height).sin() + (phase+height).cos();
+
+                let x = phase.sin() * radius + wobble * rand1;
+                let y = height + wobble * rand2;
+                let z = phase.cos() * radius + wobble * rand3;
+
                 db.0.push(AsteroidData {
                     entity: None,
                     is_spawned: false,
-                    spawned_once: false,
-                    pos: DVec3::new(
-                        player_x + offset + dist * i + wobble * (j+k/PI64).sin() * (k+j/PI64).cos(),
-                        player_y + offset + dist * j + wobble * (k+i/PI64).sin() * (i+k/PI64).cos(),
-                        player_z + offset + dist * k + wobble * (i+j/PI64).sin() * (j+i/PI64).cos(),
-                    ),
+                    pos: DVec3::new(x, y, z),
                     size: ASTEROID_SIZE,
-                    class: (((i+j+k) as i32) % 2) as u8,
+                    class: ((phase_step+radius_step+height_step) % 2) as u8,
                 });
+                count += 1;
             }
         }
     }
+    info!("Generated {count} asteroids");
 }
 
 fn spawn_despawn_asteroids(
@@ -226,7 +237,7 @@ fn spawn_despawn_asteroids(
     let mut despawned = 0;
     for asteroid in &mut db.0 {
         let dist = player.distance(asteroid.pos);
-        let should_spawn = dist < 50000.0;
+        let should_spawn = dist < 2000.0e3;
         if should_spawn == asteroid.is_spawned {
             continue;  // Nothing to do
         }
@@ -292,7 +303,6 @@ fn spawn_despawn_asteroids(
         }
         asteroid.entity = Some(entity_commands.id());
         spawned += 1;
-        asteroid.spawned_once = true;
         asteroid.is_spawned = true;
     }
     if spawned != 0 || despawned != 0 {