Callisto: The Jupiter Discovery

Great Essays
The Jupiter Adventures

At long last the Jupiter Spacecraft Voyager has finished its exploration of the largest planet in our solar system, Jupiter. The Galileo spacecraft was launched on October 19, 1989. It has been through a lot to get to the Jovian system. Even though it had malfunctions in mechanical problems the space probe still managed to survive and keep going on. Very little is known about the outside world, (space) but the discoveries that the Galilean probe has brought back will be a very valuable resource in learning more about what is out there in space. Not only do we have more information on Jupiter and the Moons that it was exploring, but we also have information on the things that the probe has passed to get to Jupiter.
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Callisto is the outer most moon of the four Galilean moons (The Galilean). The moon has a diameter of 4806km. It is also the third largest moon in out solar system and the second largest moon in the Jovian system, only after Ganymede. Callisto is the most heavily cratered object in the solar system. It is thought to be a long dead world, with hardly any geologic activity on its surface. It also has a very icy surface dating back to almost 4 billion years old (Colorado.Edu). With a surface age of about 4 billion years, Callisto has the oldest landscape in the solar system (Callisto). Beneath the icy crust is possibly a salty ocean supported by a deeper rocky interior. Callisto doesn't have any large mountains, nor does it show evidence of volcanic activity. Observations of Callisto's magnetic field may cause scientists to add the large moon to the list of possible worlds with subsurface salty oceans (The Galilean). What is most fascinating is that it only takes Callisto moon seventeen days to orbit its planet, Jupiter, the largest planet in our solar system! While, for the moon that is orbiting the Earth, it takes about thirty days. Jupiter is about 11 times the diameter of the earth. I thought that this information was pretty interesting, and weird. So the speed that Callisto is traveling at must be a lot faster than that of the Earths moon, a lot …show more content…
This moon has an orbital period of eighty-five hours! That is a crazy fast moon spinning around its planet. Europa is the smallest of the Galilean moons. Europa's surface and crust are made almost entirely of ice water. Observations made by the Galileo spacecraft show that Europa has a metallic core and a rocky mantle (The Galilean). Europa may have an ocean with more then twice as much water as the Earth does. Europa’s distance from the sun has meant that the water has frozen over, giving it the smoothest surface of any object in the Solar System.
Covering the icy surface are dark markings, which are also described as cracks. With an ocean believed to lie beneath the icy surface, it is widely surmised that tidal movements below the shell of ice have caused the cracks

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