source:

National Space Science Data Center (NSSDC). 1993. Directory Interchange Format Manual: Version 4.1. Greenbelt, MD: Goddard Space Flight Center, NASA.

Asteroids
Boundary Layer
Chromosphere
Clusters of Galaxies
Comets
Core
Corona
Crust
Equatorial
Extended Objects (Astronomy)
Galaxies
Global
High Latitude Magnetosphere
Inner Magnetosphere
Interplanetary (deep space)
Interplanetary (near Earth)
Interstellar Medium
Ionosphere
Jupiter
Local Group of Galaxies
Magnetosphere (other)
Magnetotail
Mantle
Mars
Mercury
Mesosphere
Meteoroids
Mid-Latitude
Milky Way Galaxy
Moon (Earth)
Moons (other)
Neptune
Novae
Photosphere
Pluto
Polar
Quasars
Radio Sources
Rings (planetary)
Saturn
Sea Floor
Sea Surface
Solar Interior
Southern Ocean
Star Clusters
Stars
Stratosphere
Supernova Remnants
Supernovae
Transition Region
Troposphere
Uranus
Venus

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