Moving multiple objects at same speed

Hi Im making a little animation at the end of my level where a black hole appears at the center of the screen and all the planets in the scene move towards it at the same speed simultaneously. Because the planets are all different distances away from the black hole they should reach the black hole at different times. My question is how do you move multiple objects at the same speed towards a specific point? Thanks!

It is pretty straightforward. For instance;

var Earth : GameObject;
private var Speed : float = 5;

function Update()
{
    Earth.transform.position = Vector3.MoveTowards(Earth.transform.position, Vector3(bla, bla, bla), Speed * Time.deltaTime);
}