Assertion: nebula's nature | /r/HasProperty | confirmed in early 20th century
Facets:
value: by edwin hubble
type: OTHER
value: by others
type: OTHER
value: by vesto slipher
type: OTHER
Source sentences:
text: The Andromeda Galaxy, for instance, was once referred to as the Andromeda Nebula (and spiral galaxies in general as "spiral nebulae") before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others.
text: The Andromeda Galaxy, for instance, was referred to as the Andromeda Nebula (and spiral galaxies in general as "spiral nebulae") before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others.