diff --git a/src/main/java/com/minelittlepony/unicopia/UTags.java b/src/main/java/com/minelittlepony/unicopia/UTags.java
index 184383e7..92f1473a 100644
--- a/src/main/java/com/minelittlepony/unicopia/UTags.java
+++ b/src/main/java/com/minelittlepony/unicopia/UTags.java
@@ -9,6 +9,8 @@ import net.minecraft.entity.effect.StatusEffect;
 import net.minecraft.item.Item;
 import net.minecraft.registry.*;
 import net.minecraft.registry.tag.TagKey;
+import net.minecraft.util.Identifier;
+import net.minecraft.world.dimension.DimensionType;
 
 public interface UTags {
     TagKey<Item> APPLES = item("apples");
@@ -42,6 +44,8 @@ public interface UTags {
 
     TagKey<DamageType> BREAKS_SUNGLASSES = damage("breaks_sunglasses");
 
+    TagKey<DimensionType> HAS_NO_ATMOSPHERE = dimension("has_no_atmosphere");
+
     static TagKey<Item> item(String name) {
         return TagKey.of(RegistryKeys.ITEM, Unicopia.id(name));
     }
@@ -62,6 +66,10 @@ public interface UTags {
         return TagKey.of(RegistryKeys.DAMAGE_TYPE, Unicopia.id(name));
     }
 
+    static TagKey<DimensionType> dimension(String name) {
+        return TagKey.of(RegistryKeys.DIMENSION_TYPE, new Identifier("c", name));
+    }
+
     static void bootstrap() {
         Toxics.bootstrap();
     }
diff --git a/src/main/java/com/minelittlepony/unicopia/ability/PegasusFlightToggleAbility.java b/src/main/java/com/minelittlepony/unicopia/ability/PegasusFlightToggleAbility.java
index 5ac0d19e..1692e086 100644
--- a/src/main/java/com/minelittlepony/unicopia/ability/PegasusFlightToggleAbility.java
+++ b/src/main/java/com/minelittlepony/unicopia/ability/PegasusFlightToggleAbility.java
@@ -30,7 +30,7 @@ public class PegasusFlightToggleAbility implements Ability<Hit> {
     @Nullable
     @Override
     public Hit tryActivate(Pony player) {
-        return player.asEntity().isCreative() ? null : Hit.INSTANCE;
+        return player.asEntity().isCreative() || player.getPhysics().getFlightType().isGrounded() ? null : Hit.INSTANCE;
     }
 
     @Override
@@ -54,7 +54,7 @@ public class PegasusFlightToggleAbility implements Ability<Hit> {
 
     @Override
     public void apply(Pony player, Hit data) {
-        if (player.asEntity().isCreative()) {
+        if (tryActivate(player) == null) {
             return;
         }
 
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java b/src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java
index 3fdb1882..3c61d321 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java
@@ -35,10 +35,11 @@ import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NbtCompound;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.predicate.entity.EntityPredicates;
+import net.minecraft.registry.RegistryKeys;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvents;
-import net.minecraft.text.Text;
 import net.minecraft.util.math.*;
+import net.minecraft.world.dimension.DimensionType;
 import net.minecraft.world.event.GameEvent;
 
 public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickable, Motion, NbtSerialisable {
@@ -154,6 +155,11 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
     }
 
     public FlightType getFlightType() {
+        DimensionType dimension = entity.getWorld().getDimension();
+
+        if (RegistryUtils.isIn(entity.getWorld(), dimension, RegistryKeys.DIMENSION_TYPE, UTags.HAS_NO_ATMOSPHERE)) {
+            return FlightType.NONE;
+        }
 
         if (UItems.PEGASUS_AMULET.isApplicable(entity)) {
             return FlightType.ARTIFICIAL;
diff --git a/src/main/java/com/minelittlepony/unicopia/util/RegistryUtils.java b/src/main/java/com/minelittlepony/unicopia/util/RegistryUtils.java
index a5930adb..03c35aef 100644
--- a/src/main/java/com/minelittlepony/unicopia/util/RegistryUtils.java
+++ b/src/main/java/com/minelittlepony/unicopia/util/RegistryUtils.java
@@ -49,4 +49,8 @@ public interface RegistryUtils {
             .filter(filter)
             .toList(), world.random);
     }
+
+    static <T> boolean isIn(World world, T obj, RegistryKey<? extends Registry<T>> registry, TagKey<T> tag) {
+        return world.getRegistryManager().get(registry).getEntry(obj).isIn(tag);
+    }
 }
diff --git a/src/main/resources/data/c/tags/dimension_type/has_no_atmosphere.json b/src/main/resources/data/c/tags/dimension_type/has_no_atmosphere.json
new file mode 100644
index 00000000..d275da3f
--- /dev/null
+++ b/src/main/resources/data/c/tags/dimension_type/has_no_atmosphere.json
@@ -0,0 +1,5 @@
+{
+  "replace": false,
+  "values": [
+  ]
+}