Scientists imagine running the expansion of the universe backwards in time.
What does this suggest about the universe in the distant past?
It was smaller and hotter than it is today
It was smaller and colder than it is today
It was larger and hotter than it is today
It was larger and colder than it is today
41 exam-style questions on AQA GCSE Physics 8.2 Red-shift, covering 8.2 Red-shift. Each one has a worked solution and a mark scheme showing where the marks go.