Earthlings have always been curious in Mars, a neighboring planet with a similar geologic history to our own.
Part of this is due to its closeness to Earth, making it the most visited planet (by robots, at least).
Part of it is due to a number of encouraging but subtle clues that potentially life previously lived on the planet.
A flower-shaped rock, the existence of minor electrical storms.
The likelihood that liquid water exists or perhaps did exist someplace on the surface of Mars.
It's feasible that life springs out randomly all across the cosmos.