<Li> Hot Jupiter (pegasid) </Li> <Li> Mesoplanet (a term coined by Isaac Asimov) </Li> <Table> <Tr> <Th> Planet type </Th> <Th> Description </Th> </Tr> <Tr> <Td> Giant planet </Td> <Td> A massive planet . They are most commonly composed primarily of' gas' (hydrogen and helium) or' ices' (volatiles such as water, methane, and ammonia), but may also be composed primarily of rock . Regardless of their bulk compositions, giant planets normally have thick atmospheres of hydrogen and helium . </Td> </Tr> <Tr> <Td> Mesoplanet </Td> <Td> Mesoplanets are planetary bodies with sizes smaller than Mercury but larger than Ceres . The term was coined by Isaac Asimov . Assuming "size" is defined by linear dimension (or by volume), mesoplanets should be approximately 1,000 km to 5,000 km in diameter . </Td> </Tr> <Tr> <Td> Mini-Neptune </Td> <Td> A mini-Neptune (sometimes known as a gas dwarf or transitional planet) is a planet smaller than Uranus and Neptune, up to 10 Earth masses . Those planets have thick hydrogen--helium atmospheres, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles). </Td> </Tr> <Tr> <Td> Planemo </Td> <Td> Planetary - mass object, an object which is hydrostatically round due to self - gravitation, but whose mass is insufficient to initiate fusion at its core to become a star . </Td> </Tr> <Tr> <Td> Planetar </Td> <Td> either a brown dwarf--an object with a size larger than a planet but smaller than a star--that has formed by processes that typically yield planets; or a sub-brown dwarf,--an object smaller than a brown dwarf that does not orbit a star . </Td> </Tr> <Tr> <Td> Super-Earth </Td> <Td> A super-Earth is an extrasolar planet with a mass higher than Earth's, but substantially below the mass of the Solar System's smaller gas giants Uranus and Neptune, which are 13 and 17 Earth masses respectively . </Td> </Tr> <Tr> <Td> Super-Jupiter </Td> <Td> A super-Jupiter is an astronomical object that's more massive than the planet Jupiter . </Td> </Tr> <Tr> <Td> Sub-Earth </Td> <Td> Sub-Earth is a classification of planets "substantially less massive" than Earth and Venus . </Td> </Tr> </Table> <Tr> <Th> Planet type </Th> <Th> Description </Th> </Tr>

Which of the following kinds of materials is not found on the moon