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Subject
- the sun[remove]163
- spectroscopy45
- ultraviolet astronomy30
- solar system17
- astronomical models15
- magnetic fields15
- stellar flares15
- atomic physics14
- chemical abundances11
- x-ray sources8
- stellar atmospheres6
- astrometry4
- infrared astronomy4
- photometry4
- radial velocity4
- star atlases4
- g stars3
- line intensities3
- earth (planet)2
- optical astronomy2
