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Solar and Planetary Systems

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Dernières news

1 month 5 days ago

The enormous quantity and complexity of planetary data acquired by spacecraft during the last two decades has created a demand within the planetary community for access to the raw and high level data archives and to the tools necessary to analyze these data. The number and the size of the datasets are so large that an information system to process, manage and distribute data is critical. In this framework, the Observatories of Paris Sud (OSUPS) and Lyon (OSUL) have recently developed a portal, called PSUP (Planetary SUrface Portal), to provide users with efficient and easy access to these data products.


1 year 2 weeks ago

In situ images of 67P/Churyumov-Gerasimenko acquired by the 7 CIVA cameras on board Philae revealed a singular, unexpected, and very irregular landscape dominated by consolidated materials. Following a detailed study, this landing site provided a unique opportunity to constrain the past and present conditions prevailing at the surface of the comet.

1 year 9 months ago

Gullies observed on Mars would be produced by the action of dry ice in winter and spring, not by liquid water flows as thought before. Indeed, recent numerical simulations show that under dry ice heated by the Sun, intense gas motions can destabilize and fluidize the soil, until they create flows similar to those created by a liquid.

1 year 10 months ago

Ongoing flow activity was highlighted a few years ago on Mars by high-resolution cameras. Various flow types have been identified (new channels, dark lineae, bright deposits…) but there is still no consensus about possible formation mechanisms: dry avalanche? liquid water? carbon dioxide ice? A study conducted at the Institut d’Astrophysique Spatiale reveals for the first time the composition of winter ice forming in association with flows. Results suggest the coexistence of several current formation mechanisms.

2 years 4 months ago

After 7 long months, Philae has awoken from hibernation. Its first signs of life reached Earth on Saturday evening (June, 13th) then again the following night. The hope to see Philae awake again and communicating has just come true.