<P> The climate of Mars has been an issue of scientific curiosity for centuries, in part because Mars is the only terrestrial planet whose surface can be directly observed in detail from the Earth with help from a telescope . </P> <P> Although Mars is smaller than the Earth, at 11% of Earth's mass, and 50% farther from the Sun than the Earth, its climate has important similarities, such as the polar ice caps, seasonal changes and the observable presence of weather patterns . It has attracted sustained study from planetologists and climatologists . While Mars's climate has similarities to Earth's, including periodic ice ages, there are also important differences, such as much lower thermal inertia . Mars' atmosphere has a scale height of approximately 11 km (36,000 ft), 60% greater than that on Earth . The climate is of considerable relevance to the question of whether life is or was present on the planet . The climate briefly received more interest in the news due to NASA measurements indicating increased sublimation of one near - polar region leading to some popular press speculation that Mars was undergoing a parallel bout of global warming, although Mars' average temperature has actually cooled in recent decades, and the polar caps themselves are growing . </P>

What is the average daytime temperature on mars