Deep Down, Mars is a Softie

Mars may be the god of war, but its namesake planet apparently has a soft heart. Information from the orbiting Mars Global Surveyor spacecraft suggests the martian core is at least partially fluid. In a paper published online by Science on March 7, a team of scientists from the Jet Propulsion Laboratory (JPL) and California Institute of Technology report on their analysis of more than three years of orbital data from Mars Global Surveyor.