Grand Public

MAVEN

Ci-après figurent les liens vers diverses vidéos réalisées par la NASA et consacrées à la partie instrumentale ainsi qu'à la partie scientifique de la mission MAVEN (Mars Atmosphere and Volatile Evolution) :

Maven

MAVEN artist concept Artist concept of MAVEN spacecraft. Image Credit: NASA's Goddard Space Flight Center

Octobre 2017 : MAVEN Orbiting Mars

A 3D display of science data and orbital information for NASA’s MAVEN mission to Mars. Voir la vidéo ...

13 avril 2016 : MAVEN | Martian Atmosphere Loss Explained  - NASA

Scientists have long suspected the solar wind of stripping the Martian atmosphere into space, a process that may have turned Mars from a blue world early in its history into the red planet that we see today. In 2014, NASA's MAVEN orbiter arrived at Mars and began studying its upper atmosphere.  Now, MAVEN has returned the first-ever measurements of solar wind erosion at Mars, observing ions in the upper atmosphere as they pick up energy from the electric field of the solar wind and escape to space. Voir la vidéo ...

6 novembre 2015 : Comment Mars s’est transformée en un vaste désert ? LeMonde.fr

L’agence spatiale américaine pense avoir trouvé l’origine du climat désertique qui règne à la surface de Mars. Selon la NASA, ce sont les éruptions solaires qui auraient provoqué au fil du temps la fuite de l’atmosphère de la Planète rouge, d’après les données récoltées par la sonde Maven, lancée il y a deux ans. La Terre, pourtant plus proche du Soleil que Mars, a conservé son atmosphère grâce à son champ magnétique. Voir la vidéo ...

5 novembre 2015 : Why Mars Has Less Atmosphere ? New-York Times

Readings from NASA’s Mars Atmosphere and Volatile Evolution mission, or Maven, show how the atmosphere of Mars is being removed by particles from the sun. Voir la vidéo ...

5 novembre 2015 : MAVEN | Solar Wind Strips Martian Atmosphere - NASA

In this visualization of MAVEN data, the solar wind strips ions from the Mars upper atmosphere into space. Voir la vidéo ...

MAVEN | Mapping Mars' Upper Atmosphere

High above the thin Martian skies, NASA’s MAVEN spacecraft is carrying out a mission: determine how Mars lost its early atmosphere, and with it, its water. Voir la vidéo ...

MAVEN | Mars Atmospheric Loss: Sputtering

When you take a look at Mars, you probably wouldn't think that it looks like a nice place to live. It's dry, it's dusty, and there's practically no atmosphere. But some scientists think that Mars may have once looked like a much nicer place to live, with a thicker atmosphere, cloudy skies, and possibly even liquid water flowing over the surface. NASA's MAVEN spacecraft will give us a clearer idea of how Mars lost its atmosphere, and scientists think that several processes have had an impact. One way a planet can lose its atmosphere is through a process called "sputtering." In this process, atoms are knocked away from the atmosphere due to impacts from energetic particles. Voir la vidéo ...

MAVEN | Mars Atmospheric Loss: Plasma Processes

Mars's thick early atmosphere was likely lost to space, and the Sun is a potential culprit. When high-energy solar photons strike the upper Martian atmosphere they can ionize gas molecules, causing the atmosphere to erode over time. Voir la vidéo ...

MAVEN | Mars Atmospheric Loss: Neutral Processes

When you take a look at Mars, you probably wouldn't think that it looks like a nice place to live. It's dry, it's dusty, and there's practically no atmosphere. But some scientists think that Mars may have once looked like a much nicer place to live, with a thicker atmosphere, cloudy skies, and possibly even liquid water flowing over the surface. So how did Mars transform from a warm, wet world to a cold, barren desert? NASA's MAVEN spacecraft will give us a clearer idea of how Mars lost its atmosphere (and thus its water), and scientists think that several processes have had an impact. Scientists think that the collision of neutral hydrogen molecules may have helped to drive the Martian atmosphere into space over billions of years. Voir la vidéo ...

MAVEN Imaging Ultraviolet Spectrograph

MAVEN will use its Imaging Ultraviolet Spectrograph (IUVS) to study the upper atmosphere of Mars in unprecedented detail, helping scientists to determine what happened to the planet's ancient atmosphere—and its liquid water. Voir la vidéo ...

Searching for Mars' Missing Atmosphere

MAVEN will use its Neutral Gas and Ion Mass Spectrometer to study the interaction of neutral gases and ions in the Martian atmosphere with the solar wind, helping scientists to understand how Mars has lost its atmosphere over time. Voir la vidéo ...

Measuring Mars: The MAVEN Magnetometer

When you navigate with a compass you can orient yourself thanks to Earth's global magnetic field. But on Mars, if you were to walk around with a compass it would haphazardly point from one anomaly to another, because the Red Planet does not possess a global magnetosphere. Scientists think that this lack of a protective magnetic field may have allowed the solar wind to strip away the Martian atmosphere over billions of years, and now NASA's MAVEN spacecraft will study this process in detail with its pair of ring core fluxgate magnetometers. Voir la vidéo ...

MAVEN's Particles and Fields Package: Studying the Solar Wind at Mars

To planetary scientists, the Martian atmosphere presents an intriguing mystery: today it's a thin, cold wisp of carbon dioxide with just one percent the pressure of Earth's atmosphere, but long ago it was thick and warm enough to support lakes and rivers on the Martian surface. How did Mars lose so much of its early atmosphere? Scientists think that the solar wind may be responsible, and the MAVEN spacecraft is designed to find out. The instruments of MAVEN's Particles & Fields package will study the interaction of the solar wind with Mars's upper atmosphere, helping scientists to better understand how Mars became the freeze-dried planet that we see today. In this video, produced by NASA's Goddard Space Flight Center, Robert Lin, the late director of the University of California Berkeley's Space Sciences Laboratory, discusses how MAVEN will study the interaction of the Martian atmosphere with the solar wind. Voir la vidéo ...

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