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www.universetoday.com/22603/ma

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 has been losing mass to space throughout history, and the leakage of gases still continues today. The atmosphere of Mars is colder than Earth's. Owing to the larger distance from Sun, Mars receives less solar energy and has a lower effective temperature (about 210 K).

phoenix.lpl.arizona.edu/mars111.php

Mars and Earth are very different planets when it comes to temperature, size, and atmosphere, but geologic processes on the two planets are surprisingly similar. On Mars, we see volcanoes, canyons, and impact basins much like the ones we see on Earth. Many of the same physical land features we see on Earth also exist on Mars.

science.howstuffworks.com/mars5.htm

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.nasa.gov/vision/earth/environment/Sibling_Rivalry.html

In terms of studying the Earth, one of the best comparative laboratories exists one planet over -- on Mars. In many ways, the study of Mars provides Earth-bound scientists with a control set as they look at the processes of climate change, geophysics, and the potential for life beyond our own planet.

exploration.esa.int/mars/60153-comparing-the-atmospheres-of-mars-and-earth

Mars is about half the size of Earth by diameter and has a much thinner atmosphere, with an atmospheric volume less than 1% of Earth's. The atmospheric composition is also significantly different: primarily carbon dioxide-based, while Earth's is rich in nitrogen and oxygen. The atmosphere has ...

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.

www.space.com/1582-earth-mars.html

Mars is the most Earth-like other world known, yet the two planets are really a world apart and many mysteries remain. Here's what's known: Looks ruddy from outer space, due to being covered in ...