Imagine that you live in a distant galaxy far far away. This galaxy is in a different universe, and so may have different cosmology.
It seems that in this distant universe, all galaxies have the same luminosity, which you have worked out is 7.0*10^30 W.
You are studying a particular galaxy which you have just discovered. You take a spectrum and find that it has a strong hydrogen line at a wavelength of 659.2 nm. In the laboratory, this line occurs at a wavelength of 656.3 nm.
1. What is the redshift of this galaxy?
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2. You measure the flux from this galaxy and get a value of 3.6*10^-18 Wm^-2.
How far away (in Mega-parsecs) is this galaxy?
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3. If you assume that this universe is expanding at a constant rate, how old is this universe? Type your answer in billions of years.
How far away (in Mega-parsecs) is this galaxy?
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