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  1. Uranus

    Date de publication:

    16 Juin 2016

    Uranus is the 7th planet in distance from the Sun, and the 3rd largest in the solar system (4 times larger than Earth). It is also with Neptune the coldest planet, its blue-green colour due to the methane in its atmosphere.

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  2. The exploration of Uranus

    Date de publication:

    5 Août 2003

    A thousand times fainter than Jupiter, Uranus is barely visible to the naked eye. Viewed through a telescope, it looks like a small, featureless, blue-green disc.

  3. Aurorae on Uranus detected by Hubble

    Source:

    • Sciences et techniques

    Date de publication:

    12 Avril 2012

    Among all the known planetary magnetospheres, these gaps carved in the solar wind by magnetized planets (especially the Earth and giant planets), the exotic case of Uranus had been very little studied because of its remote location (19.2 AU away from the Sun, i.e. almost 3 billions km).

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  4. Uranus' vital statistics

    Date de publication:

    5 Août 2003
  5. Gaia unveils ghost galaxy

    Date de publication:

    16 Novembre 2018

    The Gaia mission has uncovered a major event in the formation of our Milky Way galaxy, now thought to be the result of a merger with a smaller galaxy called Gaia-Enceladus. “This discovery completely changes our perception of galactic structures as we thought we knew them”, according to Carine Babusiaux, a research scientist at the IPAG planetology and astrophysics institute/OSUG, the Grenoble universe sciences observatory, in charge of simulations for the Gaia mission and co-author of a paper announcing the discovery in the journal Nature.

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  6. Source of Saturn’s kilometric radiation revealed

    Date de publication:

    12 Novembre 2018

    Using data from the Cassini mission, scientists are unravelling the mechanisms that drive auroral radio emissions at Saturn’s poles, which are key to understanding certain characteristics of the giant ringed planet. Laurent Lamy, an astrophysicist at the LESIA space and astrophysics instrumentation research laboratory (Paris Observatory) and lead author of an article on the subject in the journal Science, gives us the details.

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  7. Topics

    Date de publication:

    16 Décembre 2003

    What is space? What is weightlessness? What is an orbit?

  8. Grand Finale- Cassini bids farewell

    Date de publication:

    14 Septembre 2017

    15 September 2017 will mark the end of the Cassini mission, after 13 years exploring the Saturn system. With its fuel fast running out, the spacecraft will plunge into the gas giant’s atmosphere where it will acquire one last series of science data before breaking up and falling silent forever. Philippe Zarka, astrophysics research director at the LESIA space and astrophysics instrumentation research laboratory at the Paris Observatory, takes us through Cassini’s final minutes.

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  9. Tribute to Ichtiaque Rasool, honoured by COSPAR

    Date de publication:

    24 Mars 2017

    COSPAR honoured yesterday the eminent scientist Ichtiaque Rasool, who played a key role in furthering international cooperation between the United States and France.

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  10. 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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  11. Mercury's vital statistics

    Date de publication:

    5 Août 2003

    Mercury's vital statistics

  12. Venus' vital statistics

    Date de publication:

    5 Août 2003
  13. Jupiter's vital statistics

    Date de publication:

    5 Août 2003

    Jupiter's vital statistics

  14. Saturn's vital statistics

    Date de publication:

    5 Août 2003

    Saturn's vital statistics

  15. Neptune's vital statistics

    Date de publication:

    5 Août 2003

    Neptune's vital statistics

  16. Pluto's vital statistics

    Date de publication:

    5 Août 2003
  17. Tags associés:

  18. 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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  19. The emergence of life on Earth

    Date de publication:

    5 Août 2003

    Earth is estimated to have formed about 4.5 billion years ago. Life first appeared less than a billion years later, in the form of primitive aquatic organisms much like modern-day bacteria. These organisms set off processes such as photosynthesis and vegetable decomposition that had a profound impact on their environment.

  20. 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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