La Nasa veut chasser la vie extraterrestre sur un satellite de Jupiter. Jupiter : l'énigme de la Grande Tache Rouge est mieux comprise. Enceladus’ ocean: Huge repository of water detected under the icy moon of Saturn. Photo by NASA/JPL-Caltech I’d like to be Under the sea, In Enceladus’ ocean In the shade.
—with apologies to the Beatles New results from the Cassini Saturn spacecraft offer further evidence that the tiny moon Enceladus has an undersurface ocean of liquid water. This is pretty exciting news, since liquid water was once thought to be a commodity unique to Earth in the solar system. We’ve known for years there must be some repository of water under the surface.
La tache de Jupiter est-elle en train de disparaître ? La comète Wild 2 précise la date de formation de Jupiter. Will Jupiter’s Great Red Spot Turn into a Wee Red Dot? Want to stay on top of all the space news?
Follow @universetoday on Twitter At left, photo of Jupiter’s enormous Great Red Spot in 1879 from Agnes Clerk’s Book ” A History of Astronomy in the 19th Century”. At right, Jupiter on Jan. 10, 2014. Documents consacrés à Jupiter. L'exploration des planètes extérieures et des astres lointains. Données sur les anneaux de Jupiter. Jupiter (planète) Planète Jupiter-Planète Astronomie : planètes et satellites du système solaire. Photos de la planète Jupiter.
La planète Jupiter. Données sur les satellites joviens. Focus : Jupiter. Google Earth Jupiter Time-Lapse Movie - Freeware. Close x Important Information for Downloads Not yet registered?
Registered users have access to the quickest possible download speeds and can also access additional community features such as our "Download Alert", which automatically notifies you when a new version of this software is available. Registration is both free and simple! Formation and evolution of the Solar System. This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace.
Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.
Grand Tack Hypothesis. In planetary astronomy, the Grand Tack Hypothesis proposes that Jupiter traveled through the Solar System in the earliest 1–10 million years of the Solar System's existence, fundamentally altering the orbits of other planets as well as manipulating the orbits of asteroids.
Explanation It is proposed that Jupiter originated in an area 3.5 astronomical units (AU) away from the Sun (the planet is currently just over 5 AU from the Sun). The planet got entangled in the protoplanetary disk that prevailed at this time of the formation of the Solar System. Pulled towards the Sun, Jupiter drifted slowly inward, stopping at an orbit of about 1.5 astronomical units in diameter, probably halted by the influence of Saturn. Atmosphere of Jupiter. Cloud pattern on Jupiter in 2000.
The atmosphere of Jupiter is the largest planetary atmosphere in the Solar System. It is mostly made of molecular hydrogen and helium in roughly solar proportions; other chemical compounds are present only in small amounts and include methane, ammonia, hydrogen sulfide and water. Although water is thought to reside deep in the atmosphere, its directly measured concentration is very low. The nitrogen, sulfur, and noble gas abundances in Jupiter's atmosphere exceed solar values by a factor of about three. Rings of Jupiter. A schema of Jupiter's ring system showing the four main components.
For simplicity, Metis and Adrastea are depicted as sharing their orbit. In visible and near-infrared light, the rings have a reddish color, except the halo ring, which is neutral or blue in color. The size of the dust in the rings varies, but the cross-sectional area is greatest for nonspherical particles of radius about 15 μm in all rings except the halo. The halo ring is probably dominated by submicrometre dust. The total mass of the ring system (including unresolved parent bodies) is poorly known, but is probably in the range of 1011 to 1016 kg. The age of the ring system is not known, but it may have existed since the formation of Jupiter. Magnetosphere of Jupiter. The magnetosphere of Jupiter is the cavity created in the solar wind by the planet's magnetic field.
Extending up to seven million kilometers in the Sun's direction and almost to the orbit of Saturn in the opposite direction, Jupiter's magnetosphere is the largest and most powerful of any planetary magnetosphere in the Solar System, and by volume the largest known continuous structure in the Solar System after the heliosphere. Wider and flatter than the Earth's magnetosphere, Jupiter's is stronger by an order of magnitude, while its magnetic moment is roughly 18,000 times larger.
The existence of Jupiter's magnetic field was first inferred from observations of radio emissions at the end of the 1950s and was directly observed by the Pioneer 10 spacecraft in 1973. The action of the magnetosphere traps and accelerates particles, producing intense belts of radiation similar to Earth's Van Allen belts, but thousands of times stronger. Structure Exploration of Jupiter. Jupiter as seen by the space probe Cassini.
This is the most detailed global color portrait of Jupiter ever assembled. The exploration of Jupiter has been conducted via close observations by automated spacecraft. It began with the arrival of Pioneer 10 into the Jovian system in 1973, and, as of 2014[update], has continued with seven further spacecraft missions. All of these missions were undertaken by the National Aeronautics and Space Administration (NASA), and all but one have been flybys that take detailed observations without the probe landing or entering orbit. These probes make Jupiter the most visited of the Solar System's outer planets as all missions to the outer Solar System have used Jupiter flybys to reduce fuel requirements and travel time. Moons of Jupiter. A montage of Jupiter and its four largest moons (distance and sizes not to scale) Of Jupiter's moons, eight are regular satellites, with prograde and nearly circular orbits that are not greatly inclined with respect to Jupiter's equatorial plane.
The Galilean satellites are nearly spherical in shape, due to having planetary mass, and so would be considered dwarf planets if they were in direct orbit about the Sun. The other four regular satellites are much smaller and closer to Jupiter; these serve as sources of the dust that makes up Jupiter's rings.The remainder of Jupiter's moons are irregular satellites, whose prograde and retrograde orbits are much farther from Jupiter and have high inclinations and eccentricities.
Ganymede: Meet the Largest Moon in our Solar System. Image Credit: NASA Most people who have an interest in space and astronomy know that Europa and Enceladus have subsurface oceans that could, according to exobiologists, contain alien life. Another notable moon is Io, which has volcanic plumes that shoot 400 km (about 200 miles) into space. Jupiter la planète protectrice.
Données sur les satellites joviens. Données sur les anneaux de Jupiter. Recherche. L'exploration des planètes extérieures et des astres lointains. Jupiter (planète) Planète Jupiter-Planète Astronomie : planètes et satellites du système solaire. La planète Jupiter. Documents consacrés à Jupiter. Google Earth Jupiter Time-Lapse Movie - Freeware.