Subject
- radius2
- raw data archive1
- red giants, spectroscopy1
- redshift4
- redshift-surveys12
- redshifted1,669
- redshifted / redshift440
- redshifts6
- reduced data archive1
- reference frames1
- reference systems1
- references1
- reflectance1
- reflection nebula1
- registry40
- relativity1
- research1
- ring galaxies12
- rosat xray x-ray sources faint bright2
- rotation1
