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Galileo Regio is a large, dark surface feature on Jupiter's moon Ganymede. [1] It is a region of ancient dark material that has been broken apart by tectonism and is now surrounded by younger, brighter material (such as that of Uruk Sulcus) that has been upwelling from Ganymede's interior. It is thought to be some 4 billion years old and is ...
The discovery was announced in the Sidereus Nuncius ("Starry Messenger"), published in Venice in March 1610, less than two months after the first observations. On 12 March 1610, Galileo wrote his dedicatory letter to the Duke of Tuscany, and the next day sent a copy to the Grand Duke, hoping to obtain the Grand Duke's support as quickly as ...
During the G1 flyby in 1996, Galileo instruments detected Ganymede's magnetic field. [116] Data from the Galileo flybys was used to discover the sub-surface ocean, which was announced in 2001. [23] [40] High spatial resolution spectra of Ganymede taken by Galileo were used to identify several non-ice compounds on the surface. [52]
However, this date is erroneous based on re-constructions of Galileo's observations and Galileo himself certainly never argued that he discovered Ganymede on a latter date than all the others. Galileo's first observation of Ganymede took place on January 7, 1610 NOT January 13, and the current version of this article reflects that.
1610 – Galileo Galilei observes the four main moons of Jupiter: Callisto, Europa, Ganymede, and Io; [82] sees Saturn's planetary rings (but does not recognize that they are rings), [83] and observes the phases of Venus, [84] disproving the Ptolemaic system though not the geocentric model.
Transfer to Ganymede: A series of Callisto and Ganymede gravity assists will be performed to gradually reduce Juice's speed by 1,600 m/s (3,600 mph). Finally, a series of distant ~45,000 km (28,000 mi) flybys of the far side of Ganymede (near the Jupiter-Ganymede-L2 Lagrange point ) will further reduce the required orbital insertion delta-V by ...
This is a category of discoveries by Galileo Galilei. See parent category for proper sortkey usage instructions. ... Ganymede (moon) I. Io (moon) P. Phases of Venus; R.
The image depicts magnetic field of the Jovian satellite Ganymede embedded into the magnetosphere of Jupiter. The image is based on the reported Galileo measurements. [1] [2] The green color denotes closed field lines. The model used for this work is a superposition of the background Jovian field (120 nT) and the intrinsic field (720 nT at the ...
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