Today’s physics news: Wednesday, 4 August 2010

Chance to see Northern Lights in the UK tonight
Skywatchers in the UK will get a second chance to witness the Northern Lights tonight after missing out on the spectacular sight last night
Daily Mail 
 
Search for Martian life tools up
Is there life on Mars? That question could be answered by five scientific instruments that have just been selected to fly aboard the first ExoMars mission to the red planet in 2016
Physics World

Who’s afraid of radiation?
Our attitude to ionising radiation is irrational, and easing safety limits would do far more good than harm
New Scientist