What do astronomers and sky watchers refer to this disparity in visibility as?

Cracked by: yniu, Raghuvansh, badideabear, jowens, Dibyo, Urthstripe, Rogi, Anjul, Shwetha Maiya, Thejas V R, raklodramA, Logik, dineshk, Ananth, jins, Aravind, shrik, udupendra, mrsgollum, krudebox, Kriti Kalwad and rohanquizzer

Super famous educator. Who he?

P.S: As you might have noticed, Gremlins have started to win over us. But, we are working on a rail gun that should solve all our problems :P
Until then, questions will be kept open longer based on how late it was posted :)

Cracked by: shrik, badideabear, dineshk, Ananth, SV, jowens, Rogi, Anjul, Sajith T S, Sumanth Patlolla, Raghuvansh, yniu, Manish Achuth, Dibyo, Goyal, Shwetha Maiya, Jayaprakash B R, Thejas V R, raklodramA, Logik, S M MUNEER ALI, Vinay Nair, udupendra, krudebox and rohanquizzer