"Sixty years ago, Arno Penzias and Robert Wilson discovered the cosmic microwave background, the oldest light in the universe, released shortly after the Big Bang and detectable now as radio waves. Together with other discoveries, this has enabled scientists to put together a remarkably detailed picture of what happened just after the Big Bang. But there remains a missing piece of the puzzle - a quantum theory of gravity."
Writing a summary for young readers…
For young readers
Book data: Open Library