{"slug":"academy/astronomy/en/lesson/spectroscopy-and-stellar-composition","route":"/library/academy/astronomy/en/lesson/spectroscopy-and-stellar-composition","title":"Spectral Lines Reveal What Stars Are Made Of","surface":"/library/academy/astronomy","audience":"academy","subject":"astronomy","locale":"en","source_repo":"koydo-app","source_path":"scripts/curriculum-authoring","route_source":"library_fallback","candidate_canonical_target_web":"/library/academy/astronomy/en/lesson/spectroscopy-and-stellar-composition","license":"ai-generated-koydo","attribution":null,"ai_provenance":{"model":"claude-opus-4-8","reviewed_at":"2026-06-24T19:15:45.435Z","reviewer_persona":"koydo-curriculum-expert-loop"},"provenance_blockers":["attribution_missing"],"content_types":["lesson","lesson_objectives","media_scene","drill","practice_set","quiz","feedback","character","citation","concept_map","progress","resume","review","remediation","next_step_path"],"normalized_content_types":["character","citation","concept_map","drill","feedback","lesson","media","next_step","practice_set","progress","quiz","remediation","resume","review"],"lesson_roles":["concept","guided_practice","knowledge_check","progress_summary","remediation","review"],"primary_lesson_role":"concept","objectives":["Explain how electrons in atoms absorb or emit specific wavelengths of light to produce spectral lines.","Identify absorption spectra as dark lines on a continuous rainbow background and contrast them with emission spectra.","Interpret a stellar spectrum to infer which elements are present in a star's atmosphere.","Predict how the Doppler effect shifts spectral lines for stars moving toward or away from Earth.","Compare the spectra of two stars to draw defensible conclusions about differences in composition or motion."],"activity_prompt":"Drag each stellar spectrum card to the correct star description, matching the pattern of lines to the element fingerprints and line positions shown in the reference key.","assessment_count":3,"assessment_shape":{"objective_count":5,"activity_present":true,"activity_prompt_present":true,"quiz_item_count":3,"quiz_items_with_answer_key":3,"quiz_items_with_explanation":3,"reward_present":true},"completion_criteria":["Review objectives and instruction","Complete the activity with manual learner confirmation","Answer every understanding-check item","Show completion feedback and reward only after the learner finishes the check"],"route_health":{"route":"/library/academy/astronomy/en/lesson/spectroscopy-and-stellar-composition","route_source":"library_fallback","candidate_canonical_target_web":"/library/academy/astronomy/en/lesson/spectroscopy-and-stellar-composition","local_route_resolvable":true,"sequence_links_resolvable":true,"owner_canonical_review_required":true,"canonical_route_write_allowed":false,"production_discoverability_evidence_present":false,"production_discoverability_claim_allowed":false,"evidence_scope":"Local route syntax and previous/next link check only; owner canonical-route review and production crawl/index evidence are still required before discoverability claims."},"context_route":"/api/library/ai-help-context?slug=academy%2Fastronomy%2Fen%2Flesson%2Fspectroscopy-and-stellar-composition","grounding":["registry:academy/astronomy/en/lesson/spectroscopy-and-stellar-composition","source:koydo-app/scripts/curriculum-authoring","sha1:cadf22bb0196c7fe4d60182413a8ed227d98a71d","title:Spectral Lines Reveal What Stars Are Made Of","concept:Stellar Astrophysics","concept:HS-ESS1-2","concept:HS-PS4-4","concept:spectroscopy","concept:absorption lines","concept:emission lines"],"privacy":["Do not send raw child free text without consent","Use source excerpts and non-identifying progress state only","Asset is not registry-gated"],"age_guardrails":["Adapt tone and examples for the academy audience.","Do not request sensitive personal data; use non-identifying learner progress only.","Keep help available only for this active, ungated asset context."],"measurement":["Log AI help usage by surface and asset slug","Evaluate answer quality against source-grounded rubric before production-readiness claims","Tie remediation prompts to completion, retry, or review outcomes"],"enabled":true,"blocked_reason":null,"tutor_prompt":"You are the KOYDO lesson tutor for this asset. 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