Year 10 Science • AC9S10U03 • Authored homework
Big bang theory and universe evidence
Explain how the big bang model describes the universe’s origin and evolution, and connect the model to evidence such as redshift, expansion and cosmic microwave background radiation.
Part A
Short-answer questions
What does the big bang theory describe?
Explain why the big bang theory is a scientific model, not just a guess.
What is meant by the expansion of the universe?
What is redshift, and how is it linked to galaxies moving away from us?
What is cosmic microwave background radiation?
State one way scientists use telescopes or detectors to collect evidence about the universe.
Why does looking at very distant galaxies also mean looking back in time?
Explain one misconception about the big bang and correct it.
What is the difference between evidence and interpretation in cosmology?
Why can scientific models change when new evidence is collected?
Part B
Long-answer questions
Explain how redshift evidence supports the idea that the universe is expanding. Use scientific vocabulary and a clear cause-and-effect chain.
Describe how cosmic microwave background radiation supports the big bang model. Include why it is considered a leftover signal from the early universe.
Compare the statement “galaxies are moving through space” with “space itself is expanding”. Explain why the difference matters.
Use a labelled flow chart to show the main stages from the early hot dense universe to the formation of atoms, stars and galaxies.
Evaluate this claim: “The big bang was an explosion from one point into empty space.” Explain why this is misleading and provide a better scientific description.
Explain how evidence from different sources, such as redshift, cosmic background radiation and element abundance, makes the big bang model stronger.
Describe one limitation of using classroom models, such as dots on an expanding balloon, to represent the expanding universe.
A student says, “We cannot directly touch the early universe, so there is no evidence for it.” Respond using examples of indirect evidence in astronomy.
Explain why measurements of very distant galaxies can be uncertain. Include at least two sources of uncertainty or limitation.
Write a full scientific explanation of how the big bang theory models the origin and evolution of the universe, using at least three pieces of evidence.
Part C
Research and understanding task
Research one telescope, satellite, space observatory or astronomy dataset used to study the universe’s history. Explain what it measures, how those measurements connect to the big bang model, and one limitation or uncertainty in interpreting the data.