THE SHADOW THAT WEIGHS: A Layperson's Journey Into How Physicists Measure Things That Have No Mass But Bend Reality

Ninety five percent of the universe is invisible. You are living inside it right now. This is not a metaphor. It is the single strangest fact in modern physics, and almost nobody outside a physics department has ever had it properly explained to them. The Shadow That Weighs is the book that finally does.In 1933, a difficult Swiss astronomer named Fritz Zwicky pointed a telescope at a cluster of ga...