Texture stretching on one axis. Skybox Shader help.

So I've made a Skybox shader that creates nebula with perlin noise. I have a star field texture that I want to tile across the background.

So far however, the texture is stretc$$anonymous$$ng across a single axis, as shown.

Here's the relevant part of code:

 Pass {
         ZWrite Off 
         Cull Off 
  
         CGPROGRAM
 
         #pragma exclude_renderers d3d11 xbox360
         #pragma vertex vert
         #pragma fragment frag
 
         #include "UnityCG.cginc"
 
         float4 _StarColor;
         sampler2D _StarTex;
 
 
     struct v2f{
         float4 position : POSITION;
         float2 uv : TEXCOORD0;
     };
 
     float4 _StarTex_ST;
 
     v2f vert(appdata_base IN) { 
         v2f OUT;
 
         OUT.position = mul(UNITY_MATRIX_MVP, IN.vertex);
         OUT.uv = TRANSFORM_TEX(IN.texcoord, _StarTex);
         return OUT;
     }
 
         half4 frag (v2f i) : COLOR{
             half4 texcol = tex2D (_StarTex, i.uv);
             return texcol * _StarColor;
         }
          ENDCG 
       }