95.00.00 Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations
- 95.10.-a Fundamental astronomy
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95.30.-k Fundamental aspects of astrophysics (see also section 26 Nuclear astrophysics)
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- 95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological) (see also 95.30.Cq Elementary particle processes; for brown dwarfs, see 97.20.Vs; for galactic halos, see 98.35.Gi or 98.62.Gq; for models of the early Universe, see 98.80.Cq)
- 95.36.+x Dark energy (see also 98.80.-k Cosmology)
- 95.40.+s Artificial Earth satellites (for lunar and planetary probes, see 95.55.Pe)
- 95.45.+i Observatories and site testing
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95.55.-n Astronomical and space-research instrumentation (see also 94.80.+g Instrumentation for space plasma physics, ionosphere, and magnetosphere)
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95.75.-z Observation and data reduction techniques; computer modeling and simulation
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- 95.80.+p Astronomical catalogs, atlases, sky surveys, databases, retrieval systems, archives, etc.
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95.85.-e Astronomical observations (additional primary heading(s) must be chosen with these entries to represent the astronomical objects and/or properties studied)
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- 95.90.+v Historical astronomy and archaeoastronomy; and other topics in fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations