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.
104 exam-style questions on CIE IGCSE Physics 6.2 Stars and the Universe, covering 6.2.1 The Sun as a star, 6.2.2a Galaxies and astronomical distances, 6.2.2b The life cycle of a star, 6.2.3a Galaxies and the scale of the Universe, 6.2.3b Redshift, 6.2.3c The Big Bang Theory and cosmic microwave background radiation, and 6.2.3d The Hubble constant and the age of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.