Nowadays, the dark of night is interspersed with the light of stars. But before the stars were born, did light shine at the ...

But axions were pushed aside as the WIMPs hypothesis gained more steam. Back-of-the-envelope calculations showed that the ...

Only about 4% of the total energy density in the universe (as inferred from gravitational effects) can be seen directly. About 22% is thought to be composed of dark matter.

Physics articles from across Nature Portfolio. Atom; RSS Feed; Definition. Physics is the search for and application of rules that can help us understand and predict the world around us.

Solving linear equations - AQA Solving equations Forming, using and solving equations are skills needed in many different situations. From balancing accounts to making sense of a mobile phone bill ...