How can a object be prevented from falling ?

I tried to make projectile for a Spaceship for 3D game. But whenever I instanitate an projectile and make it move, ıt falls . I assume because of rigidbody but couldn’t find how to fix. I want projectile to move forward and not fall.

Those are components of projectile

Those are codes I used to keep projectile from falling.

public class Projectile : MonoBehaviour 
{

void Update()
    {
        //transform.position += new Vector3(-1, 0, 0) * 0.1f;
        //GetComponent<Rigidbody>().velocity = -transform.right * 100 * Time.deltaTime;
        //GetComponent<Rigidbody>().AddForce(transform.up * 0.000001f);
    }

}

just turn off use gravity :smiley: