News by Levels · Level 3 · For teachers
Teacher guide & answers
In this lesson: Separate an observed lensing effect from a proposed theoretical test.
Gravitational-Lens Gallery Supports Complementary Telescope Research
How to use these two pages
Give learners the student worksheet. It contains the story and questions, without the answers. Keep this guide for yourself. Use it to lead the activity and explain the answers afterwards.
Student worksheetA simple 15–20-minute lesson
- Before reading · 2 minutes
Show the title. Ask: “What do you think this story is about?”
- Read and answer · 8–10 minutes
Give out the student worksheet. Learners read for the main idea, then reread to answer the 2 questions. They can compare answers with a partner.
- Discuss and write · 5–8 minutes
Check the answers below together. Ask learners to point to the clue in the story, then finish with the open question.
Adjust the support: Let learners use word help or Level 1 if needed. For a challenge, compare the wording in another level. This activity is not a proficiency test.
Answers to the 2 questions
The question numbers match the student worksheet. Each answer includes a reason and the clue learners can find in the story.
Where does the light that is magnified come from?
Correct answer: C — The more distant galaxies
Why: The first paragraph identifies more distant galaxies as the source of the bent and magnified light.
Clue in the story: NASA released a Hubble lens gallery on November 12. Foreground galaxies bend and magnify light from more distant galaxies, producing distorted arcs.
What is the status of the dark-matter work described?
Correct answer: B — An intended investigation using models
Why: The second paragraph describes intended modelling and rejects treating the gallery as proof.
Clue in the story: Hubble’s detailed imaging complements Roman’s wider field. Researchers intend to model the distortions to investigate mass distributions, rather than treat the gallery as proof of a particular dark-matter theory.
The open question: accept different answers
Ask learners: Explain the observation, the planned analysis and the limit on the conclusion.
One possible answer: Foreground galaxies distort and magnify background light into arcs. Researchers intend to model these distortions to investigate mass distributions with complementary telescope views. The gallery itself is not proof of a particular dark-matter theory.
This is an example, not the only correct answer. Look for a relevant idea, a reason and the learner’s own words. Learners can answer aloud or write one or two sentences.
Grammar to discuss
Complementary strengths
complements
Complements means adds a different useful capability: Hubble’s detail works alongside Roman’s wider field.