From CNN here:
A robotic dirt and ice digger blasted off Saturday on a 422 million-mile journey to Mars that NASA hopes will culminate next spring in the first landing within the red planet's arctic circle.
The unmanned Delta II rocket carrying the Phoenix Mars Lander rose from its seaside pad at 5:26 a.m., exactly on time, and hurtled through the clear moonlit sky. It was easily visible for nearly five minutes, a bright orange speck in a spray of stars.
NASA Press release here:
Phoenix will be the first mission to touch water-ice on Mars. Its robotic arm will dig to an icy layer believed to lie just beneath the surface. The mission will study the history of the water in the ice, monitor weather of the polar region, and investigate whether the subsurface environment in the far-northern plains of Mars has ever been favorable for sustaining microbial life.
"Water is central to every type of study we will conduct on Mars," Smith said.
The Phoenix Mars Mission is the first of NASA's competitively proposed and selected Mars Scout missions, supplementing the agency's core Mars Exploration Program, whose theme is "follow the water."