This study notes covers Our Place in the Universe within Our Solar System for GCSE Physics. Revise Our Solar System in Space Physics for GCSE Physics with 14 exam-style questions and 12 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 5 of 8 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
🌌 Our Place in the Universe
- Solar System: Sun + 8 planets + moons + asteroids + comets
- Milky Way: Our galaxy — 200 billion stars in a spiral shape
- Universe: All matter, energy, space, and time — ~2 trillion galaxies
- Light year: Distance light travels in one year = 9.46 × 10¹² km
Scale: Nearest star (Proxima Centauri) = 4.2 light years away. Our galaxy = 100,000 light years across!
Practice questions for Our Solar System
Which of the following is NOT an inner rocky planet in our solar system?
Explain how gravity keeps a planet in a circular orbit around the Sun.
Quick recall flashcards
What is a light year?
The distance light travels in one year = 9.46 × 10¹² km. It's a DISTANCE, not a time!
What is a dwarf planet?
A planet-like object that is too small to clear its orbital path. Examples: Pluto, Ceres, Eris