Sombrero Gökadası
Sombrero Gökadası (ayrıca Messier 104, M104 veya NGC 4594 olarak da bilinir), Başak ve Karga takımyıldızları sınırında bulunan, sınıflandırması belirsiz Charles Messier made a hand-written note about this and five other objects (now collectively recognized as M104 - M109) to his personal list of objects now known as the Messier Catalogue, but it was not "officially" included until 1921. Slipher's spectra were among the first observations of the expansion of the universe, one of the key pieces of evidence for the Big Bang Theory. Slipher also detected rotation within the spectra of the Sombrero Galaxy.