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I am making a space scene in blender enter image description here

The sphere with that emission material is supposed to be the sun .I remember doing somthing with the Index OB pass so I have it enabled.I wan't to get sun streaks like this:enter image description here

How do I get this effect using the compositor?

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So I found a solution to this problem I could of course use the Flares Wizard addon as @Jonas said yet the question was how it can be done with the compositor. This is how it can be done:

  1. Add in a sphere which should be the sun
  2. Give it an emission material with a strength of 10
  3. Navigate to the object properties panel and in the relations ->Change the pass index of the sphere to 1
  4. Navigate to View layer properties and in the passes-> enable object index (IndexOB)
  5. Hit Render
  6. Open up the compositor and use the node setup as shown: enter image description here

enter image description here

enter image description here

Then you will get this: enter image description here

PS:If your sphere is too big you will need to tweak the node setup.Likewise adding in a blur node in between can smoothen out that sharp streaks... This is the rendered result: enter image description here

If you want just sun glare you can you this node setup: enter image description here(Add node near render layers node is not necessary)

Which will get you this effect : enter image description here

When adding the sun beams node make sure to place the cross in the middle of the sun

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