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In planetary classification, a class D planetoid is a type of planet. Planets of this type are generally smaller asteroids or moons that are locked into the gravitational pull of a larger planetary body. Class D worlds are usually composed of metals, predominantly nickel, iron and silicate. Bodies of this type generally do not support lifeforms. (ST references: Star Charts, The Worlds of the Federation; Last Unicorn RPG module: Star Trek: The Next Generation Core Game Book)

This classification was listed as class I as described in ST reference: Star Trek Maps, although the same chart was reprinted by Pocket Books in The Worlds of the Federation with the notation corrected.

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Planetary classification
numeric: class 9
("Q'tahL"-class)
alphabetical: class A
class A geothermal
class A gas giant
class B
class B geomorteus
class B gas giant
class C
class C geoinactive
class C reducing
class D class E
class F
class F geometallic
class F geocrystalline
class G
class G geocrystalline
class G desert
class H
class H desert
class H geothermal
class I
class I gas supergiant ("Q'tahL"-class)
class I metallic/silicate
class J
class J gas giant
class J moon
class K
class K silicate/adaptable
class K transjovian
class L class M ("Minshara"-class)
class MZ
class N
class N reducing
class N pelagic
class O class P class Q
class R class S class T class Y
("Demon"-class)

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