The main problem that is being solved by the Hubble Space Telescope is D. identifying the brightest stars in the galaxy.
<h3>What is Telescope?</h3>
It should be noted that a telescope simply means an instrument that's designed to make object that are far away appear closer.
In this case, the main problem that is being solved by the Hubble Space Telescope is identifying the brightest stars in the galaxy.
Therefore, the correct option is D.
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