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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.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 ...

hypertextbook.com/facts/2000/LaurenMikulski.shtml

These spacecraft provided scientists with most of the current data about Mars. The pressure at the surface of Mars is approximately 1 kPa and depends upon the Martian weather. Some sources don't give precise data, but only compare it to the earth's characteristics. Lauren Mikulski -- 2000

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.

phys.org/news/2015-12-mars-earth.html

The reason for this is the low air pressure and lack of precipitation on Mars, which results in a very slow rate of erosion. However, this was not always the case. ... Mars compared to Earth. Your ...

science.howstuffworks.com/mars5.htm

Mars has much less nitrogen (2.7 percent compared to 78 percent on Earth). It has very little oxygen (0.13 percent compared to 21 percent on Earth). The red planet's atmosphere is only 0.03 percent water vapor, compared to Earth, where it makes up around 1 percent.

mathscinotes.com/2012/10/earth-altitude-with-equivalent-pressure-to-mars

The surface pressure on Mars is equivalent to the range of pressures on Earth at altitudes between ~30 km and ~60 km. That seems like pretty thin atmosphere. Since humans require pressure suits for altitudes above ~19 km (called the Armstrong limit ), it looks like people will always be wearing pressure suits while walking about Mars.

en.wikipedia.org/wiki/Mars

Mars has two relatively small (compared to Earth's) natural moons, Phobos (about 22 km (14 mi) in diameter) and Deimos (about 12 km (7.5 mi) in diameter), which orbit close to the planet. Asteroid capture is a long-favored theory, but their origin remains uncertain.

www.esa.int/Our_Activities/Space_Science/Venus_Express/Venus_compared_to_Earth

Venus compared to Earth Venus, Mars and Earth, three out of the four inner or ‘rocky’ planets of the Solar System, have a lot in common – a solid surface you could walk on, a comparable surface composition, an atmosphere and a weather system.

phoenix.lpl.arizona.edu/mars111.php

Mars is only about one-half the diameter of Earth, but both planets have roughly the same amount of dry land surface area. This is because over two-thirds of the Earth's surface is covered by oceans, whereas the present surface of Mars has no liquid water.