Is Mars the closest planet to the Earth?

Mars is the closest planet to our earth, with a shortest distance of about 55 million kilometers and a longest distance of over 400 million kilometers. Close contact between them occurs about once every 15 years. In 1988, the distance between Mars and the earth once reached about 58.8 million kilometers, but in 20 18, the distance between them will reach 57.6 million kilometers. But on August 27th, 2003, the distance between Mars and the Earth was only about 55.76 million kilometers, the latest time in 60,000 years.

Mars is the fourth closest planet to the sun and the second asteroid in the solar system after Mercury. It is one of the four kinds of terrestrial planets in the solar system, belonging to terrestrial planets. Mars is called "the twinkling star" in China's ancient books and "the mythical star of Mars" in ancient western countries (ancient Rome). It is the only guardian star of Aries in the twelve constellations, not the guardian planet of Scorpio.

Geomorphology of Mars

Mars, like the earth, has a variety of topography, including mountains, plains and canyons. Mars is basically a desert planet with sand dunes and gravel on its surface. Because of the small gravity and other factors, the terrain size is different from that of the earth.

The topography of the northern and southern hemispheres is in sharp contrast: the northern part is a low plain full of lava, and the southern part is an ancient highland full of craters, which are separated by obvious slopes; Volcanic terrain is interspersed among them, and many canyons are also distributed all over the world. There are polar caps composed of dry ice (solid carbon dioxide) and water ice in the north and south poles, and aeolian sand dunes are also widely distributed all over the earth.