Seasonal and Daily Changes on Mars. Global and local dust storms; Dust devils; Eroded rock and dunes; Polar Caps and their variation by season; Layers within caps; Other cold-climate features; Cause of climate changes on Mars?. Global dust storms evolve in < 1 months, and last > 3 months.
Local dust storm on Mars
Dust storm from Sahara
Show constant wind direction for long periods of time.
Water (H2O) ice
Carbon dioxide (CO2) ice
MOLA data indicate that this eroding layer is about 10 cm thick
The obliquity of Mars may have varied from almost 0 – 60 degrees
The precession may have changed climate dramatically in the past on timescales of 25,000 – 175,000 years
Present – cold/dry
Past – cold and moist
Results from Viking Lander Gaschromatograph - Mass spectrometer
Labeled release experiment, looked for signs of metabolism
Pyrolytic release experiment, looked for signs of photosynthesis
Gas exchange experiment, looked for signs of respiration
ALH 84001 originated as a slowly-cooled igneous rock in the Martian crust, was excavated by an impact, altered by fluids, and finally sent to Earth by another impact. The consensus among most researchers is that these are not fossils but”ludae naturae” (playthings of nature), of inorganic origin.
Carbonate globules in Martian meteorite ALH 84001 are of inorganic origin