What Have We Learned from Comparative Planetology?

Comparative planetology has led to many significant discoveries, such as:

The Diversity of Planetary Atmospheres: From the thick, sulfuric acid clouds of Venus to the thin, carbon dioxide atmosphere of Mars, planetary atmospheres vary widely.
Geological Activity: Planets like Earth and Mars show evidence of past or present geological activity, such as volcanism and tectonics.
Presence of Water: Evidence of water, in liquid or ice form, has been found on several planets and moons, indicating potential habitats for life.
Magnetic Fields: The study of planetary magnetospheres has revealed how magnetic fields protect planets from solar radiation.