Exam-style practice

Stars and the Universe answer explanations

Review worked answers and explanations for Stars and the Universe. Aligned to Cambridge IGCSE Combined Science.

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Paper 3 structured question: Stars and the Universe

Paper 3Theory (Core)2 marks

Description

Astronomical Distances

Astronomers often use light-years to measure distances in space. A light-year is defined as the distance light travels in one year in a vacuum, which is about 9.46 trillion kilometers.

a
Define What is a light-year?
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