Subject
- optical observation2
- planetary nebulae2
- radial velocity2
- redshifted / redshift2
- solar system2
- supernovae2
- a stars1
- agn1
- astronomical models1
- astronomical object identification1
- astronomical reference materials1
- b stars1
- catalogs1
- dark matter1
- dwarf stars1
- f stars1
- galactic evolution1
- galaxy clusters1
- galaxy evolution1
- galaxy evolution and structure1
