via Space.com, NASA's latest mission to Mars, the Phoenix Lander, launched Saturday.
"A United Launch Alliance Delta 2 rocket blasted Phoenix into space at 5:26:34 a.m. EDT (0926:34 GMT), leaving a ghostly contrail of exhaust as the spacecraft left Earth behind. The lander is due to land on the flat arctic plains near Mars' north pole on May 25, 2008."
The purpose of the mission is to take soil samples of the Martian surface and test them for signs of present or past life. Many of the instruments were designed from the earlier Mars Polar Lander mission which crashed into the planet due to a programming error. The probe is already almost to top speed on its mission and should already be outside the Moon's orbit.