Assertion: meteoroid | /r/HasProperty | known since ancient times
Facets:
Source sentences:
text: Although meteors have been known since ancient times, they were not known to be an astronomical phenomenon until early in the nineteenth century.
text: Although meteors have been known since ancient times, they were not known to be an astronomical phenomenon until early in the 19th century.
text: Although meteors have been known since ancient times, they were not known to be an astronomical phenomenon until early in the nineteenth century.
text: Although meteors have been known since ancient times, they were not known to be an astronomical phenomenon until early in the nineteenth century.
text: Although meteors have been known since ancient times, they were not known to be an astronomical phenomenon until early in the nineteenth century.