Assertion: black hole | /r/HasProperty | mathematical curiosity
Facets:
value: until 1964
type: TEMPORAL
Source sentences:
text: Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity.
text: Black holes were first suggested in the 18 th century, but were considered to be a mathematical curiosity until 1964 when scientists found the first black hole that they named Cygnus X-1.
text: Black holes were long considered a mathematical curiosity; it was during the 1960s that theoretical work showed they were a generic prediction of general relativity.
text: Once considered a mathematical curiosity, black holes have taken center stage in cosmology
text: Black holes were once thought to be only a mathematical curiosity.