SPACE ATLASSTUDENT REFERENCE · GRADES 4–8
Space Atlas / Product updates

What's New

New ways to explore space, corrections that make the science clearer, and notes about how the atlas keeps improving. These are verified release milestones, not a list of every code change.

For learners

Start by exploring.

Each release links directly to a lesson or interactive model. You don't need to understand software versions to use the new activities.

For educators

See what has changed in the explanation.

Review the teaching note and scientific limitations before reusing a model or a number in class.

For maintainers

Trace the release to the code.

Each entry links to its recorded commits. These links identify changes, not a claim that each commit was a separately numbered release.

Release history

Improvements in context

Newest first. Grouped around meaningful changes to the experience, not individual refactoring commits.

Accessibility and reliability

Search and motion controls respond to your choices

Keyboard search now closes without unexpected navigation; the solar-system model respects reduced-motion preferences, and shared quizzes provide assistive-technology feedback.

For learners

Search topics with a keyboard and follow your intended selection. Motion-sensitive visitors start with a still 3D solar-system scene and may choose to resume it.

For educators

Keyboard navigation, a reduced-motion default and quiz status announcements make common classroom interactions more predictable. Screen-reader behavior still benefits from device-specific testing.

For developers · commits and checks

Resolved global Enter interception, late search-index loading, hidden-tab WebGL frame scheduling, and live-region semantics. Added a dedicated browser-flow/DOM regression gate and a prioritized code-quality audit.

Related changes: 2be659c

New learning tools

Understand why outer planets have longer years

A Kepler’s-law explorer links each planet’s orbit size with its orbital period. Behind the scenes, scheduled checks now test the published site.

For learners

Choose a planet to compare its year with an idealized orbital-period prediction.

For educators

Use the log-scale chart to introduce Kepler’s third law; check the stated model limitations before classroom use.

For developers · commits and checks

Introduced opt-in release-safe automated site health checks and added a Kepler model regression gate.

Related changes: e7e04c4

Scientific explanations

Explore temperature, tides and honest distance scales

New controls reveal signed planetary temperatures, changing lunar–solar alignment, and differences between physical AU distances and compressed model coordinates.

For learners

Compare two planets’ temperatures, vary the Moon’s alignment, or follow a planet across two distance rulers.

For educators

Read surface-vs-atmosphere temperature caveats and explain why the tide-force diagram is not a local tide forecast.

For developers · commits and checks

Added source-based interaction tests, explicit units and static evidence tables.

Related changes: 0af7155

New learning tools

Find our place in the Milky Way and apply the planet rule

New galaxy-viewing, Milky Way distance and dwarf-planet classification tools replace passive descriptions with testable choices.

For learners

Move a viewpoint or ruler and compare Pluto with other Solar System bodies.

For educators

Use the distinction between observed evidence, geometric illustrations and the IAU definition as a discussion prompt.

For developers · commits and checks

Kept original explanatory text and citations accessible without JavaScript.

Related changes: a23a673

Scientific corrections

Planet sizes now use one scale; real images inform 3D views

Corrected the Earth–Moon center separation and planet diameter comparisons, and added optional sourced 3D exterior views.

For learners

See honest planetary size ratios, change Earth–Moon distance and rotate planet views.

For educators

Compare measured planetary dimensions with conceptual views; Neptune’s texture is clearly labeled as an illustration.

For developers · commits and checks

Uses on-demand Three.js views and shared physical scales without altering existing indexed routes.

Related changes: dad8e6d, bb21e33

Evidence and sources

Read telescope imagery, spectrum and stellar paths

New evidence-led comparisons help distinguish what telescopes observe from models, illustrations and inferred science.

For learners

Compare Hubble and Webb views, explore light beyond visible colors, and follow alternative stellar evolution paths.

For educators

Use image attribution, wavelength labels and model limitations as teaching references.

For developers · commits and checks

Original NASA imagery is credited and optimized; scientific uncertainties remain explicit in the static page.

Related changes: 4f506f4, 362ae9b, 5fc40fa, dab8012

Classroom support

Classroom exploration and sharing improvements

A small teacher-oriented distribution experiment added classroom context to three selected astronomy lessons.

For learners

Continue using the same science models; the learning content remains available.

For educators

Selected lessons include classroom-use prompts and sharing actions; this is an experiment, not a claimed measured learning result.

For developers · commits and checks

Experiment is scoped to three established lessons instead of added across the full site.

Related changes: 7527210

How to read these notes

Space Atlas is an evolving educational reference. Some diagrams are scale-accurate, while others are deliberately simplified so their relationships can be seen. Each lesson states what is observed, estimated, reconstructed or illustrated. A correction in this log does not imply that an earlier visualization was scientifically equivalent to the new one.

Historical entries are reconstructed from identifiable changes in the source history. Dates reflect documented changes, not retroactive version numbering. Automated site checks verify public pages and critical files; they are not measures of improved test scores, Google indexing or learning outcomes.