thought to be composed of a mysterious substance called ' dark matter '. Various studies have been conducted to clarify the details of dark matter, but at the time of writing the article, observation ...

Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works extremely well in its own domain: Quantum theory explains how atoms and ...

Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric of space and time at the heart of Albert Einstein's theory of relativity.