A spacecraft is travelling through another galaxy. Its navigation computer stores records of three astronomical structures: a star, a solar system and a galaxy.
| Record | Information recovered |
|---|---|
| P | Several planets orbit P. |
| Q | Q is made up of P together with every object that orbits P because of P's gravitational attraction. |
| R | R is a huge collection of stars held together by gravitational attraction. |
The computer produces this report:
“P is the star, Q is the galaxy and R is the solar system. In order of increasing size, the structures are P, R, Q.”
Evaluate the computer's identification of the structures and its order of size.
84 exam-style questions on AQA GCSE Physics 8.1 Solar system; stability of orbital motions; satellites, covering 8.1.1 Our solar system, 8.1.2 The life cycle of a star, and 8.1.3 Orbital motion, natural and artificial satellites. Each one has a worked solution and a mark scheme showing where the marks go.