Off the top of my head:<p>-- Trivial pointing; no need for active pointing stabilization (aside from thermal drifts).<p>-- If you can do it on the earth-facing side of the moon, you can do it on the dark side of the moon, escaping stray light from the earth.<p>-- You can watch one target for a very long time. Earth-orbiting telescopes have to be very careful about keeping the earth out of the frame. Even geosynchronous systems will point near the earth (for some azimuths) once a day. This will come near the earth and sun once a month (each).<p>-- No need to maintain orbit. Can&#x27;t hit anything, either.<p>-- It&#x27;s really cool.<p>Edit: Here&#x27;s the wiki page: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chang%27e_3" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chang%27e_3</a><p>-- You can look at Earth trivially.<p>-- The UV imaging system is one of many instruments on the lander. Why not get a free ride to a great vantage point?