What is the approximate accuracy range modern cosmology claims for measuring the universe's actual properties?

Answer

Within a few percent, possibly reaching one percent for fundamental parameters

Modern cosmology exhibits a high degree of confidence in its current foundational understanding of cosmic expansion and composition, derived from advanced measurements. This confidence is often framed by the remarkable achievement that scientists can measure the universe's actual properties to within a few percent accuracy overall. Furthermore, for certain fundamental parameters critical to cosmological models, this level of precision may be refined even further, potentially reaching an accuracy close to one percent, suggesting a robust model that successfully reconciles diverse large-scale observations.

What is the approximate accuracy range modern cosmology claims for measuring the universe's actual properties?
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