Solar System & Orbits — GCSE Physics Revision
Revise Solar System & Orbits for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Life Cycle of StarsWhat is Solar System & Orbits?
Our solar system consists of the Sun, a star, orbited by eight planets, their moons, and other smaller bodies like dwarf planets, asteroids, and comets. The planets are held in their orbits by the Sun's gravitational force. The orbits of the planets are slightly elliptical, but are often approximated as circular for simplicity.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The role of gravity in maintaining orbits is a key concept.
Step-by-step explanationWorked example
The Earth orbits the Sun at a distance of about 150 million km and takes one year to complete its orbit. As the Earth orbits the Sun, what force keeps it in its path? Solution: The force of gravity between the Sun and the Earth provides the necessary centripetal force to keep the Earth in its orbit.
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Common mistakes
- 1Forgetting the order of the planets. A common mnemonic is: 'My Very Easy Method Just Speeds Up Naming Planets' (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune).
- 2Confusing planets with stars. Stars (like the Sun) produce their own light through nuclear fusion. Planets reflect the light from their star.
- 3Thinking that orbits are perfect circles. They are slightly elliptical (oval-shaped).
Solar System & Orbits exam questions
Exam-style questions for Solar System & Orbits with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Solar System & Orbits
Core concept
Our solar system consists of the Sun, a star, orbited by eight planets, their moons, and other smaller bodies like dwarf planets, asteroids, and comets. The planets are held in their orbits by the Sun…
Frequently asked questions
What is a satellite?
A satellite is any object that orbits another, larger object. The Moon is a natural satellite of the Earth. There are also thousands of artificial satellites orbiting the Earth, used for communication, weather forecasting, and GPS.
Why do comets have tails?
Comets are balls of ice and dust. As they get closer to the Sun, the heat vaporises the ice and dust, which is then pushed away by the solar wind, forming a tail that always points away from the Sun.