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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 ...

en.wikipedia.org/wiki/Atmosphere_of_Mars

The atmosphere of Mars is the layer of gas surrounding Mars. It is primarily composed of carbon dioxide (94.9%), molecular nitrogen (2.6%) and argon (1.9%). It also contains trace levels of water vapor, oxygen, carbon monoxide, hydrogen and other noble gases.

science.howstuffworks.com/mars5.htm

How Mars Works. by ... Of all the planets, Mars is our closest relation in terms of makeup (not distance -- Venus is closer), but that's not saying much. And it certainly doesn't mean that it is hospitable. The atmosphere of Mars differs from Earth's in many ways, and most of them don't bode well for humans living there.

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.

www.reference.com/science/atmosphere-like-mars-bdb95967c6236889

What Is the Atmosphere Like on Mars? According to Space.com, the atmosphere on Mars is around 100 times thinner compared to that of the Earth's and is composed of about 95 percent carbon dioxide. However, the Martian atmosphere is still thick enough to sustain weather, winds and clouds.

en.wikipedia.org/wiki/Mars

Mars is more likely to be struck by short-period comets, i.e., those that lie within the orbit of Jupiter. In spite of this, there are far fewer craters on Mars compared with the Moon, because the atmosphere of Mars provides protection against small meteors and surface modifying processes have erased some craters.

tomatosphere.letstalkscience.ca/Resources/library/ArticleId/4664/earth-vs-mars.aspx

Deadly Martian Atmosphere. The mixture of gases that surround a planet (or a moon) is called its atmosphere. Earth’s atmosphere, commonly called air, contains 78% nitrogen and 20% oxygen. There are also small amounts of other gases, including carbon dioxide (0.04%). For humans, the atmosphere on Mars would be suffocating.

www.answers.com/Q/What_is_the_composition_of_the_atmosphere_of_Mars

The atmosphere of Mars is relatively thin and consists of 95% carbon dioxide, 3% nitrogen, and 1.6% argon, and contains traces of oxygen, water, and methane. The atmosphere is quite dusty, giving ...

www.youtube.com/watch?v=qsOaVJI_d34

The scale height of the atmosphere is about 10.8 km, which is higher than Earth's (6 km) because the surface gravity of Mars is only about 38% of Earth's, an effect offset by both the lower ...

airandspace.si.edu/stories/editorial/today-mars-warmer-earth-see-how-we-compare

But how does Mars’ climate compare to that of our home planet? Overall, Mars is cold—its average global temperature is around -80 degrees Fahrenheit—and has a much thinner atmosphere than Earth. Because it has about a sixth of the pressure of Earth’s atmosphere, the planet doesn’t retain heat very long, causing temperatures to drop ...