{"knowledge_schema": {"broad_category": "Astronomy \u2192 Cosmology \u2192 Redshift Measurement", "refinement": "This problem involves calculating the redshift of a distant galaxy based on its observed spectral line and the parameters of the universe's expansion.", "specific_scope": "The focus is on determining the redshift (z) using the observed wavelength of the H-alpha line and the known cosmological parameters, particularly the Hubble constant.", "goal": "Calculate the redshift of the galaxy to understand its distance and the expansion of the universe."}, "summary": "This problem is rooted in cosmology, specifically in measuring the redshift of a distant galaxy based on its spectral characteristics. The observed peak at 656.3 nm corresponds to the H-alpha line, and the task is to calculate the redshift using the Hubble constant and other cosmological parameters. The goal is to determine how much the wavelength has shifted due to the expansion of the universe, which helps in understanding the galaxy's distance and the dynamics of cosmic expansion."}