A focused three-component revision and exam practice pack for SP7a, covering the complete Edexcel Separate Science Physics specification for the Solar System, changing models of its structure, and observational methods (P7.2P–P7.4P, P7.19P).

Topic Mastery Sheet covers the six types of body in the Solar System and the key features of each; the eight planets in order with a mnemonic and explanation of why inner and outer planets differ in orbital period; the shift from Ptolemy’s geocentric model through Copernicus’s heliocentric model to the modern elliptical-orbit picture, with the evidence that drove each change; and how observational methods have evolved from naked-eye to modern space telescopes. The physical reasons why the Earth’s atmosphere limits ground-based observation - absorption of non-visible wavelengths, atmospheric distortion, and light pollution - are explained, with a direct comparison of sea-level, mountain-top, and space-based telescope locations. A common misconception that Galileo invented the telescope is addressed directly.

Student Exam Practice Sheet includes a body-type identification exercise, a planet-ordering question, a geocentric-model MCQ with a follow-up explanation on how Jupiter’s moons challenged it, a telescope-location question requiring students to apply atmospheric absorption to a specific wavelength (X-rays), and a four-mark extended response on how observational methods have changed. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme with examiner notes specifying what is and is not accepted, including guidance on the telescope-location question (do not accept “closer to the galaxy”) and the extended response (any four from a seven-point list).

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