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Editor's choice

Physics World's February issue looks at the science of complex systems.

In depth: Astronomy, astrophysics & cosmology

The eerie silence

Paul Davies calls for the search for extraterrestrials to be relaunched

Law and the end of the world

Edwin Cartlidge examines the case of a US lawyer who believes that the courts must step in if required to halt experiments like the Large Hadron Collider

Between the lines

Space elevators, the Tunguska mystery and how to understand physics through the everyday

Priority battles

A dozen years after it was found, the priority dispute over who discovered dark energy lingers on, says Robert P Crease

Between the lines

The other Oppenheimer, cooking for astronauts and the "amazing" Grace Hopper

Web life: Galaxy Zoo Mergers

Galaxy Zoo 2 – the latest incarnation of the mass-participation galaxy hunt

Pakistani astronomers shine a light on the skies

Saadat A Siddiqi and Muhammad Sabieh Anwar describe how a series of astronomy events in Pakistan over the past year could help to boost the public's interest in the subject

Not crazy enough

Peter Knight passes verdict on the first 10 years of Canada's Perimeter Institute for Theoretical Physics

The trials of Galileo

Owen Gingerich recounts Galileo's famous court hearings of 1632

Between the lines

A round-up of the best books to put on your Christmas shopping list – or for someone else to buy for you

Recipes for planet formation

Michael R Meyer describes how studies of extrasolar planets are helping us to understand how planetary systems form and evolve

Human spaceflight: science or spectacle?

The big debate: David Clements and Ian Crawford spar over whether human spaceflight is worth the effort

Prince of darkness

Nuclear astrophysicist Alex Murphy shares his views on the nature of dark matter and gets excited over the forthcoming restart of the ZEPLIN III detector

Of gluons, atoms and strings

An unusual alliance between physicists who study ultrahot plasmas and ultracold atoms is yielding intriguing results – and may even lead to an experimental test for string theory, as Barbara Jacak reveals

Voyager heads for interstellar space

Richard Corfield celebrates the 20 year anniversary since NASA's Voyager mission left the solar system and began the second leg of its epic journey — an exploration of interstellar space