Subject
- galaxy clusters2
- galaxy planes2
- gamma-ray astronomy2
- magellanic clouds2
- markarian galaxies2
- nebulae2
- ob stars2
- planetary nebulae2
- radio astronomy2
- redshifted / redshift2
- solar system planets2
- stellar ages2
- stellar evolutionary models2
- stellar populations2
- supernova remnants2
- two-color diagrams2
- white dwarf stars2
- a stars1
- accretion1
- apparent magnitude1
