This packet is everything a parent or guide needs to assess Unit 06 at home — learning targets, the answers that count as correct, the mastery rubric, calibration examples, and a clipboard score sheet. No multiple-choice test: the student shows mastery by classifying galaxies from images and locating the Milky Way and a bright galaxy in the real sky.
By the end of the Galaxies & the Milky Way unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Find the Milky Way band and a bright galaxy; sketch under a red flashlight.
The student classifies a galaxy from an image and defends it (Page 4).
Classifications, dark-matter reasoning, and dated sketches kept distinct.
You are making a decision, not adding up points. For each criterion, decide whether the work is Not yet, Approaching, or Mastered — the column language tells you which. A criterion counts as mastered only when the student can both name what they see and defend the structure behind it. A student carries three tokens per term; one token buys a re-do of one criterion on another day, so a single cloudy night never sinks the unit.
Accept any answer in the synonyms column — they are pre-approved as equivalent. The third column flags the confusions that look close but are not yet, so you can coach precisely.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| Galaxies & the Milky Way | ||
| Galaxy classification | spiral, elliptical, irregular | Sort by shape from real images, not by how bright they look |
| The Milky Way's structure | disk, bulge, halo | We sit partway out a spiral arm, not at the center |
| Spiral arm | disk feature | We live inside the disk, looking through it as the Milky Way band |
| Deep-sky object | galaxy, nebula, cluster | Faint and extended; needs a dark sky and a red flashlight for night vision |
| Dark matter & large-scale structure | ||
| Rotation curve | galaxy spin measurement | Outer stars orbit too fast for the visible mass alone |
| Dark matter | unseen mass | Inferred from motion, not seen directly — not just dark sky |
| Galaxy cluster | bound galaxy group | Galaxies gravitationally gathered into groups and clusters |
| Cosmic web | large-scale structure | Clusters strung along filaments with vast voids between |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Classifying galaxies | Cannot tell galaxy types apart. | Names the types but misclassifies them from images. | Classifies galaxies as spiral, elliptical, or irregular from real images. |
| The Milky Way & our place in it | Pictures the Milky Way as random scattered stars. | Names the disk but cannot locate us within it. | Describes the Milky Way's disk, bulge, and halo and places us partway out a spiral arm. |
| Evidence for dark matter | Is unaware that anything is missing. | Has heard of dark matter but can cite no evidence. | Explains how galaxy rotation curves reveal unseen mass — dark matter. |
| How galaxies cluster | Thinks galaxies are spread evenly through space. | Says galaxies group together but not how. | Describes galaxies bound into groups, clusters, and the cosmic web. |
| Observation technique & the journal | Cannot find a deep-sky object and leaves the journal blank. | Finds the Milky Way band but keeps thin, undated notes. | Locates the Milky Way and a bright galaxy such as Andromeda with binoculars or telescope under a red flashlight and logs dated sketches. |
| Integration (cross-domain) | Treats the science as isolated facts; makes no cross-domain connection. | Names a link to history, reading, or writing but cannot defend why it matters. | Connects the unit to its anchor across History · Reading · Writing (plus chosen electives) and defends why the connection matters. |
The split between Approaching and Mastered is name what you see and defend the structure behind it: a spiral shape is a classification; the rotation curve is the evidence. Ask “what type is this, and how do you know galaxies hide extra mass?”
Read these before you grade. They show what Mastered and Not yet actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Classifying galaxies | NY / Appr / Mast | |
| 2 | The Milky Way & our place in it | NY / Appr / Mast | |
| 3 | Evidence for dark matter | NY / Appr / Mast | |
| 4 | How galaxies cluster | NY / Appr / Mast | |
| 5 | Observation technique & the journal | NY / Appr / Mast | |
| 6 | Integration (cross-domain) | NY / Appr / Mast |
☐ No ☐ Yes — for criterion: __________ Tokens remaining: ☐ 3 ☐ 2 ☐ 1 ☐ 0
NY = Not yet · Appr = Approaching · Mast = Mastered · Unsure between two levels? Circle the lower one and note what a re-do would need.