With less than two days to go before touchdown on the Red Planet, Curiosity remains in good health, with all systems operating as expected. As of today, the Mars Science Laboratory spacecraft was approximately 468,000 miles (753,200 kilometers) from Mars, or a little less than twice the distance from Earth to the moon. It is traveling at about 8,000 mph (3,576 meters per second). It will gradually increase in speed to about 13,200 mph (5,900 meters per second) by the time it reaches the top of the Martian atmosphere. That's when the seven minutes of terror will start...