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inner planets click to hear : inner planets

Rocky planets closest to the Sun; located inside the asteroid belt.
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See inner planets in : french | spanish
asteroid belt Mercury Venus Mars Earth 1 astronomical unit

asteroid belt click to hear : asteroid belt

Circular region between Mars and Jupiter containing the greatest number of asteroids; marks the boundary between the inner and outer planets.

Mercury click to hear : Mercury

The planet closest to the Sun; devoid of atmosphere, heavily cratered and marked by extreme variations in temperature (-185°C to 425°C).

Venus click to hear : Venus

Second planet from the Sun; its density and chemical composition are similar to those of Earth.

Mars click to hear : Mars

Fourth planet from the Sun; its crust contains iron oxide, giving Mars its reddish color.

Earth click to hear : Earth

Third planet from the Sun, inhabited by humankind; up to now, the only planet with evidence of life.

1 astronomical unit click to hear : 1 astronomical unit

Unit of distance equal to the mean distance between Earth and the Sun, equivalent to about 150 million km.