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11 Dec 2019
The spectra of most galaxies show redshifts. This means that their spectral lines
(a) always are in the red part of the visible spectrum.
(b) have wavelengths that are longer than normal.
(c) have a higher intensity in the red part of the spectrum.
(d) have wavelengths that are shorter than normal.
The spectra of most galaxies show redshifts. This means that their spectral lines
(a) always are in the red part of the visible spectrum.
(b) have wavelengths that are longer than normal.
(c) have a higher intensity in the red part of the spectrum.
(d) have wavelengths that are shorter than normal.
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