Ganymede+&+Callisto

 Ganymede and Callisto

 Ganymede's Definition : Third and largest of Jupiter's main moons. Callisto's Definition : The furthest from Jupiter's main moons.

Introduction: Ganymede was Discovered by Galileo and Marius in 1610. Ganymede and Callisto are both very old, similar to the highlands of the Moon and Mars. Unlike Ganymede, Callisto's craters have collapsed. Ganymede has two soils, one that is very old and the other is much younger. Has craters where the rays of ejecta can be seen. Callisto's diameter is about 99%, also its orbital radius in kilometers is about 1,880,000. Ganymede's surface is a roughly equal mix of two types if terrain: very old, highly cratered dark regions(left), and somewhat younger, (but still ancient) lighter regions marked with an extensive array of grooves and ridges(right). Ganymede is more similar to Earth than either Venus or Mars.  What we Know: <span style="font-family: Impact,Charcoal,sans-serif"> <span style="font-family: Impact,Charcoal,sans-serif">    <span style="display: block; font-size: 150%; font-family: Impact,Charcoal,sans-serif; text-align: left">
 * <span style="display: block; font-size: 140%; font-family: Impact,Charcoal,sans-serif; text-align: center">About Ganymede || <span style="display: block; font-size: 140%; font-family: Impact,Charcoal,sans-serif; text-align: center">About Callisto ||
 * * Highly cracked with dark regions. || * A little smaller than Mercury ||
 * * A lot bigger than Pluto || * Callisto is the second largest of Jupiter's known satellites. ||
 * * Two soils. || * Craters are flat. ||
 * * Ganymede is the seventh and largest of Jupiter's known satellites. || * Has the oldest surface of any body in the Solar System. ||
 * * Has craters. || * Callisto is also a name of an eclipse. ||
 * * 3 to 3.5 billion years old. || * Has a diameter of 4800 Kilometers ||
 * * Has a diameter of 5268 kilometers || * Similar in size to Ganymede ||
 * * Is not undergoing tidal heat today || * Third largest moon in the Solar System ||
 * * Similar in size to Callisto || * About the same size as mercury ||
 * * Impact craters, volcanic deposits, and tectonic structures on Ganymede's surface || * It orbits just beyond Jupiter's main radiation belt ||

<span style="font-family: Impact,Charcoal,sans-serif"> <span style="font-family: Impact,Charcoal,sans-serif"> <span style="font-size: 120%; font-family: Impact,Charcoal,sans-serif">What we want to know:

A-**Some physical features of Callisto are || A-**4800 kilometers || traveled through the air or under water, and fell back on the ground surface or on the ocean floor. Ejecta can consist of: Ganymede Io Europa Callisto || **Q-**How long is a day on Callisto? A-No Ganymede is our biggest satellite ||
 * <span style="display: block; font-size: 140%; font-family: Impact,Charcoal,sans-serif; text-align: center">About Ganymede || <span style="display: block; font-size: 140%; font-family: Impact,Charcoal,sans-serif; text-align: center">About Callisto ||
 * **Q-** How far away is Ganymede from Earth?
 * A-** The same distance as Earth is from the Sun. || **Q-** What does the atmosphere look like?
 * A-** There is no atmosphere. ||
 * **Q-** If you were to go outer space, where would you find Ganymede?
 * A-** Revolving around Jupiter. || **Q-**Who is it named after?
 * A-**Callisto is named after one of Zues's many loves ||
 * **Q-** What are the physical features?
 * A-** Craters. || **Q-**What are some physical features**?
 * **Q-** What does the core look like?
 * A-**it has a rocky core || **Q-**How big is it in diameter**?
 * **Q-** What is ejecta?
 * A-**In volcano logy, particles that came out of a volcanic vent
 * 1) Juvenile particles- (fragmented magma and free crystals)
 * 2) Cognate or accessory particles-older volcanic rocks from the same volcano
 * 3) Accidental particles-derived from the rock under the volcano
 * In planetary geology, the debris that is ejcted during the formation of an impact crater
 * In astrophysics, material expelled in stellar explosion
 * In firearms ballistics, everything expelled from a gun, including the bullet, propellant, sabot, wad,etc || **Q-**How was it discovered?
 * A-**Callisto was discovered by Galileo Galilei and Simon Marius. Galileo discovered it on January &, 1610, and Marius. observed it around the same time. ||
 * **Q-** Is there another moon bigger than Ganymede?
 * A-** No Ganymede is the biggest one in our Solar System. || **Q**-What is the orbit?
 * A-**1,883,000 kilometers from Jupiter ||
 * **Q-** Name of Satellites?
 * A-** Ganymede, Callisto, Io and Europa. || **Q-**Is Callisto a nymph?
 * A-**yes it is beloved of Zues and hated by Hera ||
 * **Q-**Order of brightness between Io Europa Ganymede and Callisto?
 * A-**From brightest to Dimmest:
 * A-**One day on Callisto is equal to approximately 16.7 days on Earth ||
 * **Q-**How big is Ganymede?
 * A-**Ganymede is 5262.4 kilometers or 0.413 Earths wide || **Q-**Is Callisto the biggest satellite in our Solar System?
 * **Q-**How old is it?
 * A-**3 to 3.5 billion years[[image:http://www.wikispaces.com/s/rte/images/italic.gif width="22" height="23" caption="Italic"]]<span style="font-family: Arial,Helvetica,sans-serif"> old || **Q-**What is it?
 * A-**It is a Galilean Moon ||

<span style="font-family: Arial,Helvetica,sans-serif">//<span style="font-family: Impact,Charcoal,sans-serif">How are Ganymede and Callisto different from each other? -// <span style="font-family: Arial,Helvetica,sans-serif">Ganymede and Callisto are different, because Ganymede is bigger and Callisto is a little smaller than Mercury. Ganymede Is the biggest moon. Callisto's Craters are flat, while Ganymede's craters are still standing.

//<span style="font-family: Impact,Charcoal,sans-serif">How are Ganymede and Callisto similar? -// <span style="font-family: Arial,Helvetica,sans-serif">They are both moons of Jupiter //.// <span style="font-family: Arial,Helvetica,sans-serif">They <span style="font-family: Arial,Helvetica,sans-serif">are also similar in size and density. <span style="font-family: Arial,Helvetica,sans-serif">They also have three layer model of ice and rock<span style="font-family: Arial,Helvetica,sans-serif">

//<span style="font-family: Impact,Charcoal,sans-serif">How are Ganymede and Callisto different from out moon? -//<span style="font-family: Arial,Helvetica,sans-serif">Ganymede and Callisto are different because Ganymede is the biggest moon in our Solar System <span style="font-family: Arial,Helvetica,sans-serif">and Callisto is a little smaller than Mercury

//<span style="font-family: Impact,Charcoal,sans-serif">What were the circumstances of their discoveries? -//The circumstances of their discoveries was that Galileo thought he was observing stars but then finally Galileo determined that what he was observing were not stars, but planetary bodies that were in orbit around Jupiter.He originally thought he saw three stars near Jupiter, strung out in line through the planet. The next evening, these stars seemed to have moved the wrong way, which caught his attention. Galileo continued to observe the stars and Jupiter for the next week. On January 11, a fourth star (which would later turn out to be Ganymede) appeared.

<span style="font-family: Impact,Charcoal,sans-serif">//What would it be like to walk on Ganymede & Callisto?// -What it would be like to walk on Ganymede is that you wouldn't really last long on Ganymede because it has thin atmosphere and also it is composed of a rocky core with a water/ice mantle and a crust of rock and ice. Ganymede's mantle is composed of ice and silicates, and its crust is a thick layer of water ice, so you probably wouldn't be able to step foot on Ganymede. What it would be like to walk on Callisto is that Callisto's atmosphere is so tenous that the carbon dioxide particles are literally drifting around bumping into one another, so this means that Callisto also has a thin atmosphere like Ganymede and is known as an exosphere. This also means that you wouldn't last long on Callisto because of its thin atmosphere and the carbon dioxide on Callisto. The chemical carbon dioxide is on the surface of Callisto and in the atmosphere above Callisto. Callisto's atmosphere this thin is easily lost due to ultraviolet radiation from the Syn, which breaks the molecules into ions and electrons which are swept away by Jupiter's magnetic field. Also if you were to step foot on Ganymede or Callisto it would be really hot and also it will burn you into ashes.