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MOON

The only natural satellite of Earth, it displays only 59% of its surface to a terrestrial observer. This is due to the period of axial rotation being equal to that of orbit, a "captured rotation".

The hidden side was first scanned by the Russian sattellite Lunik III in October 1959.

PLANETS

Distance from Sun (millions of kilometres)- 57.6

Diameter (km.)- 4,800

Time in days to orbit Sun- 88

Distance from Sun (millions of kilometres)- 107.5

Diameter (km.)- 12.240

Time in days to orbit Sun- 225

Distance from Sun (millions of kilometres)- 148.6

Diameter (km.)- 12,680

Time in days to orbit Sun- 3651/4

Polar diameter- 12,638 km; Equatorial diameter- 12,681 km

Distance from Sun (millions of kilometres)- 226.4

Diameter (km.)- 6,720

Time in days to orbit Sun- 687

Distance from Sun (millions of kilometres)- 773.3

Diameter (km.)- 141,920

Time in days to orbit Sun- 4,333

Distance from Sun (millions of kilometres)- 1417.8

Diameter (km.)- 120,000

Time in days to orbit Sun- 10,759

Distance from Sun (millions of kilometres)- 2852.5

Diameter (km.)- 49,440

Time in days to orbit Sun- 30,687

Distance from Sun (millions of kilometres)- 4469.6

Diameter (km.)- 52,800

Time in days to orbit Sun- 60,127

Distance from Sun (millions of kilometres)- 5865.6

Diameter (km.)- 6400

Time in days to orbit Sun- 90,400