hey guys im learning that if the planet or moon looks sweet on the screen as far as brightness it will b over exposed after the stack burning out the finer details crank it down a lil if ur not geting the fine details like u want make it dimmer with brightness and gain remember a lot of gain gives a lot of grain lol its true so a dimmer image stacked will brighten up and if it is not bright enough after the stack strech the history grahm on it to brighten it up without messing up the background it works well brings those details that ur looking for out i no it may sound crazy but try it press foward