Nasa All Stars: SDSS – Sloan Digital Sky Survey

Navigate The sky server at SDSS.

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Redshift/Blueshift animation

Different types of spectra

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An old Astronomy Picture of the Day (APOD) that show a diffraction spike and explains it rather simply.

An article that talks about the diffraction pattern around bright stars seen in telescope images.

A detailed description of what causes the diffraction lines or “spikes” we see around bright stars. The picture at the beginning is helpful

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