We know AGN are about the size of our Solar System because of imaging done with the Hubble Space Telescope.

Name: We know AGN are about the size of our Solar System because of imaging done with the Hubble Space Telescope.
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Quizplus · Accepted Answer

Imaging with the Hubble Space Telescope has allowed us to study the structure and activity of AGN, but it cannot directly determine their physical size. AGN are actually much larger, with their size ranging from tens of light-years to tens of thousands of light-years.

We Know AGN Are About the Size of Our Solar