NASA will be attempting to land the Curiosity rover on the surface of Mars tonight, and you can watch it live.
Curiosity (the Mars Science Laboratory) was launched almost a year ago on November 26, 2011, and will be finishing its 354 million mile journey to the red planet tonight (Sunday, August 5th) at around 8:30pm PST. The craft will be deploying a supersonic parachute to slow itself, as it will be traveling at upwards of 1,000 mph.
The show's not over though, as the first images from the surface of Mars will also be shared live, sometime between 12:30am and 1:00am on August 6. That is assuming all goes according to plan and the rover successfully lands of course.
Until then, you can learn more and watch the countdown at GetCurious.com.