Jonathan Amos, BBC News:
Within minutes, the robot was returning its first low-resolution images - showing us its wheels and views to the horizon. A first colour image of Curiosity's surroundings should be returned in the next couple of days.Engineers and scientists who have worked on this project for the best part of 10 years punched the air and hugged each other.
The rover's a Twitter feed announced: "I'm safely on the surface of Mars. GALE CRATER I AM IN YOU!!!"