Physics and Astronomy Classification Scheme 1999

98. Stellar systems; interstellar medium; galactic and Extragalactic objects and systems; the Universe ( 0 Dok.)

• 98.10.+z Stellar dynamics and kinematics ( 0 Dok. )

• 98.20.-d Stellar clusters and associations ( 0 Dok. )

• 98.35.-a Characteristics and properties of the Milky Way galaxy ( 0 Dok. )

• 98.38.-j Interstellar medium (ISM) and nebulae in Milky Way ( 0 Dok. )

• 98.52.-b Normal galaxies; extragalactic objects and systems (by type) ( 0 Dok. )

• 98.54.-h Quasars; active or peculiar galaxies, objects, and systems ( 0 Dok. )

• 98.56.-p Local group; Magellanic Clouds ( 0 Dok. )

• 98.58.-w Interstellar medium (ISM) and nebulae in external galaxies ( 0 Dok. )

• 98.62.-g Characteristics and properties of external galaxies and extragalactic objects (for the Milky Way, see 98.35) ( 0 Dok. )

• 98.65.-r Galaxy groups, clusters, and superclusters; large scale structure of the Universe ( 0 Dok. )

• 98.70.-f Unidentified sources of radiation outside the solar System (for cosmic rays in the Solar System, see 96.40; for pulsars, see 97.60.G) ( 0 Dok. )

• 98.80.-k Cosmology (see also 04 General relativity and Gravitation; for origin and evolution of galaxies, See 98.62.A; for elementary particle and nuclear Processes, see 95.30.C; for dark matter, see 95.35; for superclusters and large-scale structure Of the Universe, see 98.65.D) ( 0 Dok. )

• 98.90.+s Other topics on stellar systems; interstellar medium; galactic and extragalactic objects and systems; the Universe (restricted to new topics in section 98) ( 0 Dok. )