Assertion: telescope's optic | /r/HasProperty | technique
Facets:
Source sentences:
text: Newer, more advanced ground-based telescopes implement adaptive optics, a technique to sharpen blurry images right as they’re being taken.
text: Active optics is a technology used with reflecting telescopes developed in the 1980s, which actively shapes a telescope's mirrors to prevent deformation due to external influences such as wind, temperature, mechanical stress.