Assertion: atomic clock | /r/CapableOf | reach that threshold
Facets:
Source sentences:
text: This makes it the first atomic clock to ever reach that threshold, and 20 times more accurate than its predecessor.
text: The experimental data show the 3-D quantum gas clock achieved a precision of just 3.5 parts error in 10 quintillion (1 followed by 19 zeros) in about 2 hours, making it the first atomic clock to ever reach that threshold (19 zeros).