I'd have to go with "wind."
winds
Mars
Yep
Mars and Earth.
Yes, most of the surface is sand.
Mars and Earth.
Barchan dunes are the crescent-shaped sand dunes commonly observed on Mars. They have a characteristic shape with a gentle slope facing the prevailing wind direction and a steeper slope facing away from the wind. Barchan dunes are formed by the movement of wind-blown sand.
They had found ice on mars but no sign of a liquid
The black things seen on Mars are likely to be sand dunes or volcanic rocks. Mars has a variety of geological features that can appear dark or black in color due to different compositions and processes on the planet's surface.
The first flight to Mars was the Mars Ingenuity helicopter carried by the Perseverance rover, which landed on Mars on February 18, 2021. The helicopter's mission was to demonstrate powered flight in the thin Martian atmosphere.
Jarosite is the sulfate mineral found on the surface of Mars that indicates the past presence of liquid water.
Probably the Babylonians were the first to observe and record the presence of Mars, which would make it around 700 BC.