Which statement correctly describes a galaxy?
A large collection of billions of stars, along with dust and gas, bound together by gravity.
A single star and all the planets, moons, and other objects orbiting around it.
A group of stars that form a recognizable pattern when viewed from Earth.
Only the eight planets and their moons orbiting the Sun.
59 exam-style questions on CIE IGCSE Physics 6.2.3a Galaxies and the scale of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.