Why does it work when I use ParticleSystem#Pause(), but not ParticleSystem#Stop()?

For some reason, when I run this code:

void Update()
        if (gameObject.GetComponent<Rigidbody>().velocity.y <= -10)
            Vector3 vel = gameObject.GetComponent<Rigidbody>().velocity;
            vel.y = -10;
            gameObject.GetComponent<Rigidbody>().velocity = vel;
        } else

The particles never start.
However, if I change gameObject.GetComponent<ParticleSystem>().Stop(); to gameObject.GetComponent<ParticleSystem>().Pause(); it works perfectly fine. I don’t want to use Pause(); I want the particles to completely dissapear, but be able to reappear!

How can I do this?

Maybe you can use Stop() and then Clear()