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Contents of the Universe: Dark Matter and Dark Energy

Amazingly, 95% of the make-up of the universe is stuff we can't see, according to cosmologists. Find out more about dark energy and dark matter, which far surpasses the amount of visible mass in the universe.

Physics Spotlight10

Optical Frequency Comb

Definition of optical frequency comb

2005 Nobel Prize in Physics

The 2005 Nobel Prize in Physics was awarded to three researchers who had helped advance the quantum understanding of optics and lasers.


Definition of a maser - a microwave laser

Chaotic Inflation

Definition of Chaotic Inflation

Eternal Inflation

Definition of Eternal Inflation

The Island of Knowledge

Theoretical physicist and philosopher Marcelo Gleiser reflects upon the limits of our scientific understanding and how we search for meaning.

Tau Lepton

Definition of Tau


Definition of substrate


Definition of a constructor

David Deutsch

British theoretical physicist David Deutsch advocates for not only exploring the deepest mysteries of the universe, but also understanding them.

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