Quasar spectrum (IMAGE)

DOE/Lawrence Berkeley National Laboratory

Quasar spectrum

Caption

DESI collects spectra, the different frequencies of light that objects in space emit. That light tells researchers how far away the object is, meaning they can create a 3D map of the universe. This spectrum is from an incredibly distant quasar more than 12 billion light-years from Earth. The universe’s expansion has stretched the light’s wavelength and shifted it into the infrared.

Credit

Eleanor Downing/DESI collaboration

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