It's been something of a rough month for the Hubble Space Telescope. Toward the end of October, NASA detected that Hubble's science instruments had lost synchronization and automatically entered safe ...

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The main function of a telescope spectrograph is to separate light into its component colours (or wavelengths) to reveal information about the chemical content, temperature and motion of distant ...

Click to open image viewer. This is a Littrow spectrograph constructed by Donald Menzel in the 1930s and used on numerous eclipse expeditions conducted by the Harvard College Observatory. This was one ...