Ka hor inta aanay New Horizons duulin, waxaa jiray laba aragtiyood oo is khilaafsan oo ku saabsan qaab dhismeedka gudaha ee Charon: qaar ka mid ah saynisyahannadu waxay u maleynayeen in Charon uu yahay jir kala duwan sida Pluto, oo leh dhagax dhagax ah iyo jaakad baraf ah, halka kuwa kale ay u maleynayeen inay noqon doonto mid isku mid ah. Caddaynta taageeraya mowqifka hore waxaa la helay 2007, markii indha-indheynta Gemini Observatory ee jaangooyooyinka ammonia iyo kristantarrada biyaha ee dusha sare ee Charon ay soo jeediyeen joogitaanka kristantarrada qorraxda ee firfircoon.
Pluto