Relative Size

The Sun has a diameter of approximately 865,000 miles (1,392,000 km). It is almost ten times larger than the largest planet, Jupiter, which is itself big enough to contain all the other planets put together. The planets are shown here to scale against the Sun. Those planets with orbits inside Earth's orbit are sometimes referred to as the inferior planets; those beyond Earth are the superior planets. The four small planets that orbit the Sun relatively closely—Mercury, Venus, Earth, and Mars—have masses lower than those of the next four, but have much greater densities (p.45). Jupiter, Saturn, Uranus, and Neptune have large masses with low densities. They are more widely spaced apart and travel at great distances from the Sun.

Mars and two Moons

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