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Author: WikiMatrix
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English[en]
These "spiral nebulae" were not recognized as galaxies until Edwin Hubble was able to observe Cepheid variables in some of these spiral nebulae, which provided evidence that they were so far away that they must be entirely separate galaxies even though they are seen close together .
Indonesian[id]
Galaksi yang dikenal dengan "nebula spiral" ini tidak diakui sebagai galaksi sampai Edwin Hubble mampu mengamati variabel Cepheid di beberapa spiral nebula ini, yang memberikan bukti bahwa benda-benda disekitarnya memang merupakan galaksi yang terpisah.