Penguin Readers is an ELT graded reading series, designed for teenagers and young adults learning English as a foreign language.

With carefully adapted text, new illustrations, language practise activities and additional online resources, the Penguin Readers series introduces language learners to bestselling authors and compelling content. Titles include popular classics, exciting contemporary fiction, and thought-provoking non-fiction.

Unlocking the Universe, a Level 5 Reader, is B1 in the CEFR framework. The text is made up of sentences with up to four clauses, introducing present perfect continuous, past perfect, reported speech and second conditional. It is well supported by illustrations, which appear regularly.

Unlocking the Universe takes us on a journey through space and time. It starts 13.8 billion years ago with the Big Bang, which led to the stars, the planets and our Solar System. Then it explores our Solar System and other solar systems - the ones we know, and others we have yet to find.