It has been known for some time that Mars undergoes many large changes in its tilt or obliquity .
Its two small moons lack the gravity to stabilize it , as our moon stabilizes Earth ; at times the tilt has even been greater than 80 degrees
It has been known for some time that Mars undergoes many large changes in its tilt or obliquity because its two small moons lack the gravity to stabilize it , as our moon stabilizes Earth ; at times the tilt has even been greater than 80 degrees