Cosmology

Dark matter is not just a puzzle. It is a solution

We asked a number of physicists for their reaction to the announcement of neutrinos breaking the cosmic speed limit

In this excerpt from the new book Knocking on Heaven's Door: How Physics and Scientific Thinking Illuminate the Universe and the Modern World (Harper Collins, 2011), you'll learn why, although it's true that scientists sometimes have been wrong, that doesn't mean there are no rules--or that everything is possible

Encounters with the Sagittarius Dwarf Galaxy could have had huge effects on the structure of the Milky Way

New findings spotlight conflicting results from search for elusive theoretical particles.

NASA's WISE satellite has found a Y dwarf star, cool enough to touch, that is the hub of the seventh closest star system to us. John Matson reports

Physicist Gino Segre follows the intertwining lives of Max Delbrück and George Gamow as they use physics, insight and luck to make strides into exciting new scientific fields

A new study may help scientists determine when stars were born

Volcanoes have coughed up ancient diamonds from hundreds of kilometers beneath Earth's surface. Their trace impurities provide some priceless information about the first shifts in plate tectonics

Excess events suggest LHC is homing in on elusive particle.

Flagship missions at risk as astrophysics funding shrinks.