What are today's imponderables?
What mysteries of the universe are yet to be solved?
Where will they lead?
What will be the next discovery?
The latest in The Ponderables series - The Universe An Illustrated History of Astronomy includes a removable fold-out that provides a 12-page 'Timeline History of the Universe' that embeds the story in historical context and shows Who Did What, When at a glance. The fold-out also includes is a 12-page star chart of the night sky of the Northern and Southern hemispheres for every month.