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Five major planets in our solar system will shine brightly in a row during a rare planetary conjunction from Friday.

An important shared trait among these worlds, however, is their mere existence: six of the eight major planets of our solar system have moons.

The 60 frames that Voyager returned incorporated the Sun and six of the major planets - Venus, Earth, Jupiter, Saturn, Uranus and Neptune.

In order to explain the present architecture of the major planets a certain amount of orbital rearrangement, or migration, is often invoked.

On one wall he made a scale drawing of the major planets, ranging from little Mercury, represented by a circle about as big as a marble, to Jupiter, as big as a basketball.