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A computer simulation of superheated plasma swirling around the black hole at the center of our galaxy.

In what was once possible only in "complete science fiction," scientists at the University of Arizona are organizing the creation of a virtual super-telescope that will take the first photographs of a black hole, and test Einstein’s General Theory of Relativity. Read more»

City Hall

Guest opinion: Albert Einstein defined insanity as "doing the same thing over and over again and expecting different results." It's time to break that cycle in city government in Tucson and bring some sanity to the process by voting yes on Prop 401. Read more»

Text and video of President Obama's speech on comprehensive immigration reform. Read more» 1

The 47-nation conference that ended this week was a unique effort to spotlight what has become the most dangerous prospect the world faces, the summation of all terrors. Securing the world's loose nuclear material is rising to the top of Obama's agenda. Read more»