Assertion: horsehead nebula | /r/CapableOf | grace astronomy books
Facets:
value: since its discovery
type: TEMPORAL
Source sentences:
text: The iconic Horsehead Nebula has graced astronomy books ever since its discovery more than a century ago in 1888 by Scottish astronomer Williamina Fleming.
text: Looking like an apparition rising from whitecaps of interstellar foam, the iconic Horsehead Nebula has graced astronomy books ever since its discovery more than a century ago.