spaceship flying freely without gravity

Phaser 3
1

Hi
I am trying to get an object to move freely without gravity lika a spaceship in space.
I am just starting out som I know very little about Phaser. I have just messed a little with the first tutorial code.
Can anyone tell me how I can get my object to move freely on the screen?
This is my code:

var config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    physics: {
        default: 'arcade',
        arcade: {
            gravity: { y: 300 },
            debug: false
        }
    },
    scene: {
        preload: preload,
        create: create,
        update: update
    }
};

var player;
var cursors;
var game = new Phaser.Game(config);

function preload (){
    this.load.image('sky', 'assets/sky.png');
    this.load.image('star', 'assets/star.png');
}

function create (){
    this.add.image(400, 300, 'sky');
    player = this.physics.add.sprite(400, 300, 'star');
    player.setCollideWorldBounds(true);
    cursors = this.input.keyboard.createCursorKeys();
}

function update (){
    if (cursors.left.isDown){
        player.setVelocityX(-160);
    }
    else if (cursors.right.isDown){
        player.setVelocityX(160);
    }
    else if (cursors.up.isDown){
        player.setVelocityY(-160);
    }
    else if (cursors.down.isDown){
        player.setVelocityY(160);
    }
    else{
        player.setVelocityX(0);
    }
}
2

See https://phaser.io/examples/v3/view/physics/arcade/asteroids-movement.