Assertion: collimator's problem | /r/HasProperty | discussed among astronomer
Facets:
value: often
type: TEMPORAL
Source sentences:
text: This problem is recognized and often discussed among astronomers but so far there has been no definite solution in the market.
text: This problem is recognized and often discussed among astronomers but so far there has been no definite solution in the market.
text: This problem is clearly recognized and often discussed among astronomers but so far there has been no definite solution in the market.
text: This problem is clearly recognized and often discussed among astronomers.