Mars, NASA

TL;DR: NASA's Viking 1 spacecraft, which landed on Mars in 1975, aimed to test for life using water-based methods.
Despite decades of exploration, no conclusive evidence of life on Mars has been found—though past missions may have come ...
NASA's Perseverance Mars rover spots a scattering of bizarre bright white pebbles of a mysterious composition and origin.
Firming up plans to go to Mars would be fine, so long as it is not done at the expense of returning to the moon.