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You observe a faint galaxy and find that a spectral line normally found in the visible part of the spectrum is now seen at infrared
wavelengths. From this you conclude that the galaxy:
is moving away from you and has a very low mass.
is moving towards you.
has an unusual chemical composition.
has a very low mass.
is moving away from you.

Expert Solution

Introduction:

The wavelength at which we see absorption lines are unique in themselves. This was used by astronomers to measure the position of the lines. We are seen initially the visible regions of spectrum. We then see that now the region which was visible has become infrared. This means that the wavelength has increased.

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