Not all celestial bodies - for instance our Moon is currently in this respect completely out of service, but in the past it might not been. Likewise, the two moons of Mars, Phobos and Deimos. Generally speaking, any "little guy" in the solar system and in space, without higher temperature underground and molten nucleus, like geothermal energy. Objects, that do not hold any atmosphere and do not exhibit a volcanic activity, will appear similarly.
Si wote miili ya mbinguni - kwa mfano Moon yetu sasa katika hii heshima kabisa nje ya huduma, lakini katika siku za nyuma hivyo ili si. Aidha, mwezi mbili ya Mars Phobos na Deimos. Kwa ujumla, yoyote "guy kidogo" katika mfumo wa jua na katika nafasi, bila kiini juu joto chini ya ardhi na kuyeyuka, kama nishati ya mvuke. Vitu, kwamba si kushikilia yoyote anga na wala kuonyesha shughuli volkeno, itaonekana vile vile.