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phoenix.lpl.arizona.edu/mars111.php

Mars/Earth Comparison Table 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.

www.lpi.usra.edu/publications/slidesets/redplanet2/slide_1.html

1. Earth-Mars Comparison . This image compares Mars and Earth in their correct relative sizes. Mars (diameter 6790 kilometers) is only slightly more than half the size of Earth (diameter 12750 kilometers). Note the difference in color between the two planets. Almost 70% of Earth's surface is covered by liquid water.

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 ...

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

But while Earth's features eternally change, they do not persist with the same permanence as features elsewhere in the solar system. For a particularly interesting comparison, we look to Mars. In the entire solar system, Mars boasts general features that are some of the biggest, widest, and deepest.

www.ehow.co.uk/about_4568768_how-big-mars-compared-earth.html

Mars is roughly half the size of the Earth. It has a diameter of 4,222 miles, compared to Earth's 7,962 miles at the equator. Mars is 53% as large as Earth; this means that Mars has a gravity that is less than 40% of what people feel on Earth.

sciencing.com/similarities-differences-mars-earth-8425570.html

Mars is nearly twice as large as the Moon and a little over half the size of Earth, according to the Center for Mars Exploration. The diameter of Mars is about 6,786 kilometers (4,217 miles), compared to that of Earth, which is about 12,756 kilometers (7,926 miles). In addition, Earth has a mass that is 10 times greater.

www.jpl.nasa.gov/spaceimages/details.php?id=PIA02570

Earth Mars Comparison This composite image of Earth and Mars was created to allow viewers to gain a better understanding of the relative sizes of the two planets. The Earth image was acquired from the Galileo orbiter at about 6:10 a.m. Pacific Standard Time on Dec. 11, ...

sciencing.com/mars-earth-common-10034859.html

Scientists gain a greater understanding of Earth by studying the similarities and differences between it and the other terrestrial planets, specifically Mars. Mars is the second closest planet to Earth, besides Venus, averaging 225 million miles apart between the furthest and closest points in its orbit. The greatest ...

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 ...