Assertion: satellite | /r/HasProperty | explorer
Facets:
value: on jan.
type: TEMPORAL
Source sentences:
text: The United States' first satellite was Explorer 1 on Jan. 31, 1958.
text: The United States launched their first satellite, called Explorer 1 on January 31, 1958.
text: The United States orbited its first satellite, Explorer 1, three months later (January 31, 1958).