Dialed in: The Mars Relay Network (MRN) is an international constellation of five spacecraft orbiting the Red Planet that send precious science data from the rovers back to Earth. You can track which spacecraft are transmitting in real time at science.nasa.gov/mars/mars-relay-network | NASA Mars

Sometimes scientists use enhanced-color images to reveal subtle variations on the surface of Mars. This view from our Mars Odyssey orbiter highlights details in clouds hovering over canyons in the Margaritifer Terra region in December. More from Odyssey: science.nasa.gov/mission/odyssey/ | NASA Mars