Experts suggest much of the water Mars once had is now locked up in minerals.
Another key milestone is reached in the ExoMars Rosalind Franklin rover mission to the Red Planet.
Getting to the Red Planet is challenging, and so it working out how many have failed.
Airbus-UK wins a contract to advance the design of a robot for the Red Planet with four big wheels.
Europe and Russia look set to postpone the launch of their Mars surface mission to 2022.
The next US space agency robot to explore the Red Planet will carry a small helicopter with it.
Day-to-day operation of the Rosalind Franklin Mars rover will be run out of a facility in Turin.
Europe prepares to send technology to Mars to look for evidence that there is life on the planet.
Engineers are making sure their joint European-Russian rover will perform as expected on the Red Planet.
The most sensitive search to date for the gas that might signal life on the Red Planet draws a blank.