{"knowledge_schema": {"broad_category": "Cosmology \u2192 Distance Measurements \u2192 Comoving Distance", "refinement": "This problem involves understanding the relationship between redshift, wavelength, and comoving distance in a cosmological context, particularly within the Lambda-CDM model.", "specific_scope": "The focus is on determining the comoving distance of a quasar based on its observed properties in the near infrared and optical spectrum, specifically at a peak wavelength of 790 nm.", "goal": "To calculate or estimate the comoving distance of the quasar from Earth, given the parameters of the Lambda-CDM model."}, "summary": "This problem is rooted in cosmology, specifically in measuring distances in the universe using the Lambda-CDM model. The quasar's observed peak wavelength of 790 nm suggests a significant redshift, which can be related to its comoving distance from Earth. Given the parameters of the universe, including the Hubble constant and density parameters, the task is to estimate the quasar's comoving distance, which is determined to be 8 Gpc based on the provided options."}