RS4K Book 3 — Astronomy (Ch 18-21): Grade 3 atoms-first chapters. Foundation 100%, Gap 0.0%, Map Error 0.0%, Practices 85.7%, no FSEs. Galaxies and cosmology with explicit epistemic framing. Recommended Deep.
| Program | RS4K - Science Book 3 — Astronomy |
| Publisher | Gravitas Publications Inc. |
| Author | Rebecca Woodbury, Ph.D., M.Ed. |
| Grade Band | Grades 3-5 |
Verdict: ✓ Recommended — Deep. Foundation_calc 100.0%, deep tier. Practices 85.7% green (book-wide score). Zero map errors. Zero confirmed FSEs.
Strict atomic-foundation scoring. The Astronomy quarter of Book 3 (Chapters 18-21) uses the universal atomic claims established in Ch 3 and Ch 10 as the explanatory anchor. Adjusted Gap 0.0%, Map Error 0.0%.
Chapters 18-21 cover galaxies, stars, and the cosmos. Ch 18 introduces galaxies and the classification system. Ch 19 covers the Milky Way with explicit epistemic framing (‘No one has taken a picture of the whole Milky Way — astronomers can guess by observing other galaxies’). Ch 20-21 cover stars and quantitative comparisons (170 billion galaxies framed as marbles wrapping the Earth 30 times).
"There are about 170 billion galaxies in the observable universe." (Ch 18 quantitative cosmology)
"No one has taken a picture of the whole Milky Way — astronomers can guess by observing other galaxies." (Ch 19 epistemic framing)
"Stars are made of atoms — mostly hydrogen and helium gas." (Ch 20-21 stellar composition)
FSE_CONFIRMED: 0. No factual science errors found in this quarter.
Map errors: 0. No OAO error (REI-substance, REI-agent, LAE, AEC all zero).
Practices: 85.7% green. Five of seven NGSS scientific practices PRESENT; mathematics and argument-from-evidence are PARTIAL. Every chapter operationalizes the question-hypothesis-experiment-data-conclusion arc through the RATATAZ Experiment series. The practices score is computed book-wide and applies identically to all five subject entries.
Nothing structural. The Astronomy chapters score clean on every WWG metric.
The five RS4K Book 3 subject entries (Chemistry, Biology, Physics, Geology, Astronomy) all share Foundation 100%, Adjusted Gap 0.0%, Map Error 0.0%, Practices 85.7% — the curriculum’s architecture is uniform because Chemistry establishes the universal atomic claim in Ch 3 and Physics extends it to subatomic particles in Ch 10.
| Total Passages Scored | 14 |
| Raw Gap Error | 85.7% (6 of 7 mechanism passages do not name atoms in the passage itself but are SCAFFOLDED by Ch 3/Ch 10 atomic framings) FALSE = atoms/molecules not present before students are asked to explain. The student is navigating without a starting point. |
| Adjusted Gap Error | 0.0% (0 UNSCAFFOLDED — atomic foundation established in Ch 3 and Ch 10, used throughout) UNSCAFFOLDED = no atomic grounding at all. LESSON_ATOMS = atoms mentioned elsewhere in lesson but not connected to this concept. |
| Substance-Model Errors (REI) | 0 Curriculum treats a process or outcome as a substance - "heat flows," "energy is stored," "electricity flows like water." Student builds a substance ontology. |
| Label-as-Explanation (LAE) | 0 Curriculum provides a name and treats it as an explanation - "this happens because of gravity." Student believes knowing the name IS understanding the concept. |
| Vague-Entity Errors (AEC) | 0 Curriculum uses vague entities ("tiny particles," "building blocks") without specifying atoms or molecules. Student invents their own model with macroscopic properties. |
| Factual Science Errors (FSE) | 0 Statements that are scientifically incorrect - not imprecise framing, but wrong. Any confirmed FSE = Not Recommended. |
| Practices | 85.7% - Deep Seven practices scored PRESENT, PARTIAL, or ABSENT and averaged: asking questions, developing and using models, planning and carrying out investigations, analyzing and interpreting data, using mathematics, constructing explanations and designing solutions, and argument from evidence. Higher is better, the opposite direction from gap and map errors. Reported but not part of the Foundation Score or the verdict. |
Galaxies and cosmology at K-3 with explicit epistemic framing about what astronomers can and cannot directly observe. Quantitative cosmic-scale comparisons.
Atomic foundation established in Chemistry (Ch 3) and extended to subatomic particles in Physics (Ch 10), then used throughout the Astronomy quarter. Galaxies and cosmology at K-3 with explicit epistemic framing about what astronomers can and cannot directly observe. Quantitative cosmic-scale comparisons. Practices 85.7% green (book-wide).
Recommended (Deep) — Deep by design -
Evidence for every entry is published at three levels. Each level states what it contains and what it leaves out.
Scores, verdict, and the full pattern count for this unit are above: adjusted gap, REI / LAE / AEC counts, FSE status, and the seven-practice score. Passage-level detail for this unit is carried in the downloadable evidence file.
This file covers the unit scored on this page.
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