Some 78 million miles (126 million kilometers) from Earth, alone on the immense and frigid Red Planet, a robot the size of a small 4×4 wakes up just after sunrise. And just as it has every day for the past six years, it awaits its instructions.
Around 9:30 Mars time, a message arrives from California, where it was sent 15 minutes earlier.
“Drive forward 10 meters, turn to an azimuth of 45 degrees, now turn on your autonomous capabilities and drive.”
The Curiosity rover executes the commands, moving slowly to its designated position, at a maximum speed of 35 to 110 meters (yards) per hour.
Its batteries and other configurations limit its daily drive span to around 100 meters. The most Curiosity has rolled on Mars in a day is 220 meters.
Once it arrives, its 17 cameras take shots of its environs.
Its laser zaps rocks. Other tools on board drill into a particularly interesting rock to study small samples.
Around 5 pm Martian time, it will wait for one of NASA’s three satellites orbiting the planet to pass overhead.
Curiosity will then send several hundred megabytes of scientific data via large ground antennae to its human masters on Earth.

On the ground floor of building 34 at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, scientists pore over Curiosity’s data every day at 1 pm, in a large windowless room full of scientific instruments and computers.
The scientists are looking for any indication of life on Mars.
Inside Curiosity lies a “marvel of miniaturization,” says Charles Malespin, the deputy principal investigator for Sample Analysis at Mars (SAM), a chemist’s lab the size of a microwave oven.
“It’s the most complicated instrument NASA has ever sent to another planet,” said Malespin, who has devoted his professional life to the project since 2006.

No joystick
On the other side of the United States, at NASA’s Jet Propulsion Laboratory in Pasadena, California, about two dozen men and women make up the team that drives Curiosity.
“My favorite part of the day (is when) I get to sit down and start looking at the imagery from Mars and understand where the rover currently is,” said Frank Hartman, who has driven both Curiosity and another, older rover, Opportunity.
“And my feeling is that sometimes I’m probably the first person on Earth looking at some of these pictures.”
The Mars drivers’ main job is to write the sequence of commands for the rover to follow the next sol, or “day” on Mars, which lasts 24 hours and nearly 40 minutes. There is no joystick, and no real-time communication with the robotic vehicle.
There is a delay whenever drivers realize something has gone wrong, whether it’s Opportunity getting buried by a Martian dust storm earlier this year, or one of Curiosity’s wheels getting pierced by a sharp rock.
Or the breakdown of Curiosity’s drilling machine, which happened at the beginning of this year and took a few months to resolve.



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