With Curiosity now safely on the surface of the Red Planet after last night's spectacular entry, descent and landing in Gale Crater, NASA's Mars Science Laboratory begins its planned primary one-Martian-year (98-week) mission of discovery and exploration.

On its first Martian day, designated Sol 0, the rover is checking its health and measuring its tilt.

All Sol 0 spacecraft activities appear to have been completely nominal.

These include firing all of Curiosity's pyrotechnic devices for releasing post-landing deployments.

Spring-loaded deployments, such as removal of dust covers from the Hazard-Avoidance cameras (Hazcams) occur immediately when pyros are fired.

Curiosity also took images with its front and rear Hazcams both before and after removal of the dust covers, checked out its UHF telecommunications system and rover motor controller assembly, and completed all activities required to proceed with its planned activities on Sol 1.

Approximately five megabytes of data were successfully relayed back to Earth from NASA's Mars Odyssey spacecraft during its overpass.

Curiosity landed facing east-southeast within Gale Crater, with a heading of 112.7 degrees (plus or minus five degrees), and a few degrees of tilt.

A Sol 1 overpass by Mars Odyssey will provide additional information on Curiosity's position and additional imagery.

A first look at some color images taken just before landing by MSL's Mars Descent Imager also provided additonal information on the rover's precise location.

Activities planned for Sol 1 during the mission's approximately one-month characterization activity phase include deploying Curiosity's high-gain antenna, collecting science data from Curiosity's Radiation Assessment Detector and Rover Environmental Monitoring Station instruments, and obtaining additional imagery.

The mission's characterization activity phase is design to learn how all Curiosity's subsystems and instruments are functioning after landing and within the environment and gravitational field of Mars.