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- Comet Halley[remove]10
- IR spectra1
- N2 molecule1
- astronomy2
- astrophysics1
- cometary dust1
- dust production rates1
- gases and solids1
- heliophysics1
- meteor streams1
- meteoric complex1
- neutral and ionized gas1
- observations1
- perihelion1
- photoelectric photometry1
- pre-perihelion photometry1
- radar observations1
- solar system exploration1
- space measurements1
- tail length1