Like Earth, Mercury is one of four terrestrial planets. It is known as a terrestrial planet because it has a solid ground surface made up of rock and metal. This surface makes Mercury's density very similar to that of th... More »

Most of the surface of the planet Mercury is gray or dark gray in color. The surface is, however, broken up by small and large craters and several areas of lighter gray. More »

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There is not much known about Mercury or its surface, except that it is similar to the moon in appearance and its composition consists of primarily molecular oxygen, sodium and hydrogen. There are also small amounts of h... More »

Beginning with the planet closest to the Sun and moving outward, the order of the planets is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Before its reclassification as a dwarf planet by the Internat... More »

The nine planets in order are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and, if it's still considered the ninth planet, Pluto. However, not only has Pluto been demoted to a dwarf planet by some astron... More »

The eight described planets all orbit the Sun at different distances; Mercury is the closest planet to the sun, followed by Venus, then Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The distances of the planets are n... More »

One rhyme to remember the planets is "Amazing Mercury is closest to the Sun, Hot, hot Venus is the second one, Earth comes third; it’s not too hot, Freezing Mars awaits an astronaut, Jupiter is bigger than all the rest, ... More »