duck

float bulletFlightTime = (targetAlien.transform.position - newProjectile.transform.position).magnitude / bulletMoveSpeed;
Vector3 alienPredictedPos = targetAlien.transform.position + targetAlien.rigidbody.velocity * bulletFlightTime;
newProjectile.rigidbody.velocity = (alienPredictedPos - newProjectile.transform.position).normalized * bulletMoveSpeed;