i installed a space ship from the asset store and i made a script with c# to make it move but i got an error

in the script the space ship went up instead of forward so i had to change vector3.forward to vector3.down but when i tried to make it move forward by pressing space this error popped up the error says error cs0019: operator ‘*’ cannot be applied to operands of type ‘UnityEngine.Vector3’ and ‘bool’

this is my script

using UnityEngine;
using System.Collections;

public class move : MonoBehaviour {
public float MoveSpeed = 10.0f;
// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
	transform.Translate (Vector3.down * Input.GetKey ("space"));
}

}

Input.GetKey() returns a boolean value (i.e. true/false) and can be used like so:

void Update () {
    if(Input.GetKey("space")) {
        transform.Translate(Vector3.down);
    }
}

Input.GetAxis() returns a float and can be used like this:

void Update () {
    transform.Translate(Vector3.down * GetAxis("Vertical"));
}