Player bouncing off issue

Hi. I'm doing space shooter game and I have one issue. When I'm flying into my planet(big sphere with sphere collider) for longer then one hit(my cube whitch represends my ship just bounce for a while on sphere) and i stop presing control button my ship flyes away from planet. I don't know what to do and how i can prevent it. Any help? I'm attaching my scripts from planet and player. Player(has collider and ridgitbody) :

 using UnityEngine;
 using System.Collections;
 
 public class GraczS : MonoBehaviour {
     
     public float speed= 10;
     
     
     
     // Update is called once per frame
     void Update () {
         
 
         float front_w  = Input.GetAxis("Vertical")* speed * Time.deltaTime;
         transform.Translate(Vector3.forward * front_w); 
         float upanddown = Input.GetAxis("UpandDown") * speed * Time.deltaTime;
         transform.Translate(Vector3.up * upanddown );
         float side_w  = Input.GetAxis("Horizontal")* speed * Time.deltaTime;
         transform.Translate(Vector3.right * side_w);
         
 
         
     }
 
 
 }
 

And planet(Only collider)

 using UnityEngine;
 using System.Collections;
 
 public class Ziemia : MonoBehaviour {
     public float predkoscObrotu ;
 
     // Update is called once per frame
     void Update () {
         transform.Rotate(Vector3.up * predkoscObrotu * Time.deltaTime);
     }
 }