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  1. Neptune

    Date de publication:

    5 Août 2003

    Neptune was the first planet to be discovered not through observation, but by predicting its existence using calculations based on the universal theory of gravitation.

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  2. Venus

    Date de publication:

    5 Août 2003

    Of similar size and mass to Earth, Venus is sometimes considered its sister. The similarity stops there, however, and little is known about the evolutionary processes that created this peculiar planet.

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  3. Saturn

    Date de publication:

    5 Août 2003

    Long thought to be the only planet with a ring system, Saturn is a gas giant much like Jupiter:

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  4. Pluto

    Date de publication:

    5 Août 2003

    The smallest and usually the most distant planet in our solar system, Pluto is unique as it is neither a terrestrial planet nor a gas giant. Another surprise is its orbit which, rather than being circular and very near the ecliptic plane like the other planets, is highly elliptical and tilted.

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  5. Voyager missions: at the edge of the Solar System

    Date de publication:

    14 Juin 2006

    Launched nearly 30 years ago, the Voyager 1 space probe is now 100 times further from the Sun than Earth is, some 15 billion km away. With its twin Voyager 2, it is set to go past the edge of the Solar System, where no spacecraft has ventured before.

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  6. Pluto is no longer a planet

    Date de publication:

    24 Août 2006

    At its General Assembly in Prague, the International Astronomical Union decided that Pluto should no longer be considered a planet in the Solar System. It shall now be classed in a new category of celestial objects called “dwarf planets”, quite separate from the 8 “real” planets.

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  7. Mercury

    Date de publication:

    5 Août 2003

    The closest planet to the Sun, Mercury is also the smallest of the telluric or Earth-like planets.

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