1.   And their field of study just expanded, inasmuch as each large galaxy comprises perhaps a billion stars.

2.   In simulations, it usually produced large galaxies much as they are in reality.

3.   Many large galaxies may harbor dormant quasars, just waiting for some upsetting events to provide fuel so that they could shine again.

4.   Now imagine that there are two other large galaxies between Earth and the quasar.