Telescopes
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- twinkling
- Spitzer
- spectrum
- spectroscopy
- refraction
- reflection
- redshift
- red-hot
- radiowaves
- radiotelescope
- radioactive
- quantummechanics
- prism
- photon
- interferometry
- infraredradiation
- excitedstate
- emissionlines
- element
- electromagneticradiation
- diffractiongrating
- chromicaberration
- cassegraintelescope
- angstrom
- adaptiveoptics
- absorptionlines
- absorptionlines