On the bright lunar morning, the sky is always dark due to the absent of atmosphere which is as black as midnight. Isn’t it an astronomer’s paradise? No. Not a single star was visible. The glaring, sunlit ground ruined the man’s night vision. Only Earth itself is bright enough to be seen, luminous blue and white, hanging overhead.
Based on this conclusion, we know that a dark sky is not enough. A dark environment is needed too. However, we can’t really find a dark site in urban areas due to the high growing light pollution.
What about on the lunar night? Could an astronomer bear the cold temperature which may be as low as 40 K? I wonder anyone of us could. Don’t you think that a special designed suit is able to eliminate this problem? Everyone of them must feel incovenient in observing, I guess. What about establishing an observatory on the Moon? I am sure that space based telescope like HST is much more better as the observatory will be an easy target for the asteroid.
Thanks to Maximilion for bug hunting. 
