Subject
- line intensities2
- magellanic clouds3
- metallicity1
- morgan-keenan classification1
- multiple stars1
- nebulae9
- observation1
- observational astronomy15
- open star clusters4
- optical astronomy9
- photographic photometry1
- photometry40
- planets9
- pre-main sequence stars3
- quasars2
- radial velocity1
- radio astronomy1
- radio sources1
- redshifted7
- solar system astronomy9