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. )

• 98.70.Dk Radio sources Quasars, see 98.54.A ( 0 Dok. )
• 98.70.Lt IR sources (for IR sources in interstellar medium, see 98.38.J and/or 98.58.J) ( 0 Dok. )
• 98.70.Qy X-ray sources; X-ray bursts (see also 97.30.Q novae, dwarf novae, 97.80.J X-ray binaries) ( 0 Dok. )
• 98.70.Rz Gamma-ray sources; gamma-ray bursts ( 0 Dok. )
• 98.70.Sa Cosmic rays (including sources, origin, acceleration, and interactions)(see also 26.40 Cosmic ray nucleosynthesis) ( 0 Dok. )
• 98.70.Vc Background radiations ( 0 Dok. )