{
  "course": {
    "courseNumber": "ASTR 420",
    "courseCode": "ASTR420",
    "title": "Cosmology",
    "credits": 3,
    "term": "Fall",
    "yearInCurriculum": 4,
    "prerequisites": "ASTR310; MATH255; PHYS271",
    "description": "Introduces relativistic cosmology including expansion, redshift, distance measures, the CMB, nucleosynthesis, structure formation, dark matter, dark energy, and observational tests."
  },
  "status": {
    "stage": "approved for review release",
    "reviewStatus": "Approved for review release; not yet approved for instructional use",
    "lastUpdated": "2026-09-25"
  },
  "counts": {
    "slides": 14,
    "notes": 14,
    "labs": 7,
    "problemSets": 7,
    "solutionKeys": 7,
    "assessmentInstructions": 7
  },
  "cadence": {
    "lectures": 14,
    "labs": 7,
    "problemSets": 7,
    "rationale": "Matched 1:1 biweekly cadence: seven units each contain two lectures followed by one lab and one problem set; the second lecture completes the quantitative toolkit used by the paired data activity."
  },
  "dataProvenance": {
    "generator": "materials/ASTR420/src/generate_astr420_package.py",
    "levels": {
      "level1": "Local OpenStax extracted text and source-index files were inspected this session; adopted-PDF exercise wording remains a human spot-check.",
      "level2": "CMB, BAO, supernova, BBN, and matter-power values are standard published summaries not re-verified this session; human spot-checks are required.",
      "level3": "Compact CSV extracts, SVG diagrams, and model curves are instructor-provided teaching artifacts derived from the level-2 summaries."
    }
  }
}