A self-test on the scale of the universe, the CMB and matter proportions, and how the lines of evidence fit together (AC9S10U03, nodes 1, 4 and 5, taught in class; node 5 a hinge).
Load these into Waypoints Prepare: choose Load URL and paste the copied address, or download the file and import it. In Prepare, the worksheet's Teacher edition shows the answers; the student copy hides them.
Node 1 6 min · Node 4 5 min · Node 5 5 min
A Quick check: a few questions on what students should know for AC9S10U03 nodes 1, 4 and 5, which you teach in class. It has no board, no clip and no new teaching, and it is optional, so it never holds up course completion. Set the width with ?width=minimum, typical (default) or wider.
Use it as a self-test after your teaching, a starter, or revision. The big bang and redshift lessons are on screen (nodes 2 and 3). A scale activity (a class-sized solar system, or a number line) and a discussion of dark matter work better in the room.
Holding the sizes in mind. When a student mixes light-years and kilometres, ask what the distance would look like in each.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student says a light-year is a length of time. | What does light do in a year? | It travels. The light-year is the distance it covers. |
| A student says the big bang was an explosion in space. | Where was the space? | Space itself expanded. There was no outside to explode into. |
Stretch: How long does light from the Sun take to reach Earth (about 8 minutes)? Use it to place one AU on a scale in light-minutes.
Support: Give the scale list on cards to order, with a unit sheet (AU, light-year).
For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.
You are a patient science coach for a Year 10 student in Australia. Help me understand the ideas in ONE lesson only, from the lesson "Quick check: scale, the cosmic glow and the evidence". The ideas: - Scale and structure of the universe: I can describe the major structural components of the universe using appropriate scale and units, and place Earth within the cosmic hierarchy. - Cosmic microwave background radiation and matter proportions: I can describe how cosmic microwave background radiation and the observed proportions of matter in the universe provide independent lines of evidence supporting the big bang theory. - Analysing the evidence base — how multiple lines support the theory: I can analyse how redshift, CMB and matter proportions together constitute a mutually supporting evidence base for the big bang theory, and explain what each line independently demonstrates. What understanding looks like: - Names the major structural components of the universe in order of scale - Uses light-years or astronomical units correctly in a distance context - Uses scientific notation to express cosmological distances or ages - Describes cosmic microwave background radiation and explains what it indicates about the early universe - Explains that the proportions of matter (hydrogen, helium) in the universe are consistent with big bang predictions - Identifies CMB and matter proportions as independent lines of evidence, separate from redshift - Analyses how at least three lines of evidence independently support the big bang theory - Explains what each evidence type demonstrates and why convergence strengthens the theory - Acknowledges at least one open question or area of ongoing investigation in cosmology Mistakes students often make here: - A student says a light-year is a length of time. - A student says the big bang was an explosion in space. How to coach me (rules from the Waypoints Kit coach): - Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question. - Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit). - If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go. - If I seem to be missing the idea that comes before this one (Redshift and the expanding universe), check it quickly, then come back. - Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back. - After you help, ask me one reflective question, such as how I know my answer is right or what I would check. - Praise my effort and method, not my ability. - You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so. - Use simple words. - Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "Quick check: scale, the cosmic glow and the evidence".
Name two lines of evidence for the big bang and what each shows.
Redshift: the universe is expanding. CMB: it was hot and dense early. (Or hydrogen and helium proportions.)
Back in class: a model of the expanding universe (dots on a balloon); discussion of what is still unknown.