Synthesized answer
The provided passages do not contain specific information about the questions that remain unanswered in Stephen Hawking's "A Brief History of Time." The passages describe the book as a phenomenon that discusses ideas at the cutting edge of the known universe when it was published [1]. They also mention that extraordinary advances in observational technology and theoretical sciences have occurred since its initial release, leading to a new golden age in cosmology and theoretical sciences, with Professor Hawking being a major contributor to this renaissance [1].
However, the passages do not enumerate or detail any specific unanswered questions that the book addresses or raises. Therefore, based solely on the provided text, it is not possible to list the questions that remain unanswered.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: A Brief History of Time by Stephen Hawking Description: Stephen Hawking's ‘A Brief History of Time* has become an international publishing phenomenon. Translated into thirty languages, it has sold over ten million copies worldwide and lives on as a science book that continues to captivate and inspire new readers each year. When it was first published in 1988 the ideas discussed in it were at the cutting edge of what was then known about the universe. In the intervening twenty years there have been extraordinary advances in the technology of observing both the micro- and macro-cosmic…