2. The purpose of the “Spirit” and “Opportunity” missions was to study the surface of Mars to determine any past water activity (liquid water does not exist in Mars today due to temperature and pressure conditions) such as sedimentation, precipitation, and evaporation based on soil and rock samples selected and tested by the rovers. The three things learned about Mars surface are it has a very thin atmosphere (at only 6% of Earths atmospheric pressure), the Martian atmosphere is composed mainly of gases carbon dioxide (95%), nitrogen (3%), argon (1.6%) and other rare gases; and lastly, its Martian rocks are made mostly of basalt and fairly high levels of nickel and iron in some of the soil samples and rocks taken and tested so far.
3. The purpose of the latest mission to Mars is to study the planet up close with the use of a mobile scientific laboratory on its surface. Its success is defined by the innovative way it landed using a giant parachute and in the final seconds, lower the rover on piece of tether. Its success is to demonstrate an ability to land a very large and heavy rover, a good preparation for a manned expedition to Mars in the future (JPL 1).
4. The highest mountain on Mars (and in the entire solar system) is the Olympus Mons which rises some 25-27 kilometers from the surface plain. It is of volcanic origins and it reached this incredible height due to intense volcanic activity in the years past.
5. A very interesting image taken by the rover Curiosity is that of the Gale Crater area in which there is very fine sand, similar to or characteristic of a desert. The whole area is colored bright rust due to the presence of iron-rich minerals in its regolith.
6. The Curiosity rover, in one of its explorations, found a dry riverbed that showed flow channels for water, very similar to those found on Earth. This was a conclusion made by Sanjeev Gupta regarding the discovery of rounded pebbles on the dry streambed, as it