An astronomer detects Cosmic Microwave Background Radiation (CMBR) coming from all directions in space. Which statement about CMBR is correct?
It is evidence of a contracting Universe, supporting the Steady State theory.
It is the redshifted remnant of radiation from the early Universe, supporting the Big Bang theory.
It is high-frequency radiation emitted recently by stars in nearby galaxies.
It is light from distant stars that has been blueshifted as it travels through space.
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.