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en.wikipedia.org/wiki/Atmosphere_of_Mars

The atmosphere of Mars is a resource of known composition available at any landing site on Mars. It has been proposed that human exploration of Mars could use carbon dioxide (CO 2) from the Martian atmosphere to make rocket fuel for the return mission.

www.space.com/16903-mars-atmosphere-climate-weather.html

Mars is a planet that shows climate change on a large scale. Although Mars' atmosphere used to be thick enough for water to run on the surface, today that water is either scarce or non-existent.

en.wikipedia.org/wiki/Composition_of_Mars

Like Earth, Mars is a differentiated planet, meaning that it has a central core made up of metallic iron and nickel surrounded by a less dense, silicate mantle and crust. The planet's distinctive red color is due to the oxidation of iron on its surface.. Much of what we know about the elemental composition of Mars comes from orbiting spacecraft and landers.

www.space.com/16895-what-is-mars-made-of.html

The atmosphere of Mars is too thin to easily support life as we know it. It is about 95 percent carbon dioxide. The extremely thin air on Mars can also become very dusty.

www.reference.com/science/mars-composition-mars-atmosphere-2ed93ee33a0d42f9

The composition of Mars' atmosphere is 95.32 percent carbon dioxide, 2.7 percent nitrogen, 1.6 percent oxygen and 0.08 percent carbon monoxide. The remaining 0.3 percent is made up of various trace elements. One of the trace elements detected in the Martian atmosphere is methane.

science.howstuffworks.com/mars5.htm

Because the "air" on Mars is so thin, it holds little of the heat that comes from the ground after it absorbs solar radiation. The thin air also is responsible for the wide, daily swings in temperature (almost 100 degrees Fahrenheit or 60 degrees Celsius). Martian atmospheric pressure changes with ...

www.britannica.com/place/Mars-planet/Composition-and-surface-pressure

Mars - Composition and surface pressure: Carbon dioxide constitutes 95.3 percent of the atmosphere by weight (see the table), nine times the quantity now in Earth’s much more massive atmosphere. Much of Earth’s carbon dioxide, however, is chemically locked in sedimentary rocks; the amount in the Martian atmosphere is less than a thousandth of the terrestrial total.

mars.nasa.gov/allaboutmars/facts

Mars planet facts and information. Compare Earth & Mars. Fun science images for kids, school, family & space fans. Mars in space, night sky & history.

nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html

Mars Observational Parameters Discoverer: Unknown Discovery Date: Prehistoric Distance from Earth Minimum (10 6 km) 55.7 Maximum (10 6 km) 401.3 Apparent diameter from Earth Maximum (seconds of arc) 25.1 Minimum (seconds of arc) 3.5 Mean values at opposition from Earth Distance from Earth (10 6 km) 78.39 Apparent diameter (seconds of arc) 17.9 Apparent visual magnitude -2.0 Maximum apparent ...

www.universetoday.com/22603/mars-compared-to-earth

Mars is the 4th planet from Sun, and the place that holds our imagination because of the possibility that there might be life there. There are some similarities to Earth, like its day length ...