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The scale of the universe
Order objects from planets to superclusters and use light-travel time and light-years to describe cosmic distances.
⏱ 18 min❓ 8 questions
What you'll be able to do
- ✔I can order astronomical objects from planets to galaxy superclusters by size and distance
- ✔I can explain what a light-year is and calculate light-travel times
- ✔I can explain why looking at distant objects means looking back in time
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
8 questions and 1 quick teaching card, including:
- ↕️Put in order — Use the up and down arrows to sort the steps.
- 🔢Number answer — Work out the answer and type the number.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9S10U03