For two decades, it's been our robotic emissary to the Red Planet: today marks 20 years since the Mars Odyssey mission launched. Since arriving at Mars, it has mapped the planet from orbit while helping rovers and landers on the ground connect with Earth. More: https://go.nasa.gov/3sXwvRS At this very moment, Odyssey is still active at its post high above Mars, sending home fresh reports. You can track its current position, and see when it’s transmitting to Earth, at http://go.nasa.gov/3cVxyfB a