Halton Arp: "Bayangkan diri Anda selama awal 1920-an di dalam kubah Mo...

"Bayangkan diri Anda selama awal 1920-an di dalam kubah Mount Wilson Observatory. ... Humason menunjukkan bintang-bintang Shapley yang dia temukan di Nebula Andromeda yang muncul dan menghilang pada foto-foto objek itu. Astronom terkenal itu dengan sangat sabar menjelaskan bahwa benda-benda ini bukan bintang karena Nebula adalah awan gas terdekat di dalam sistem Bimasakti kita sendiri. Shapley mengambil saputangan dari sakunya dan menyeka tanda pengenal dari bagian belakang pelat fotografi."

--- Halton Arp

Versi Bahasa Inggris

Picture yourself during the early 1920's inside the dome of the Mount Wilson Observatory. ... Humason is showing Shapley stars he had found in the Andromeda Nebula that appeared and disappeared on photographs of that object. The famous astronomer very patiently explains that these objects could not be stars because the Nebula was a nearby gaseous cloud within our own Milky Way system. Shapley takes his handkerchief from his pocket and wipes the identifying marks off the back of the photographic plate.