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Important Moons

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Cassandra Layton

on 15 November 2012

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Transcript of Important Moons

Jupiter's Moons:
Galilean Moons Important Moons What Is A Moon? Io Europa Ganymede Callisto The Moon What Is A Moon Made Of? Io is the closest moon to Jupiter and is the fourth largest moon in the solar system. It has over 400 active volcanoes which makes it the single most geologically active object in our solar system. With all these volcanoes the lava flow changes the surface colour of the planet. It can change parts into shades of yellow, red, white, black and green due to different amounts of sulfur. Callisto is the third largest of satellites in the solar system. It is almost the size of Mercury but only one third of the mass. Callisto is the outermost of the Galilean satellites. Before we really knew what the moon was, we used the different positioning to help figure out when the rivers would flood and to help guide the Harvest.
Now over the years we have learned many new things about the Earths moon, some of which help us keep track of a yearly calendar and we also now know that the moon causes a tide to occur. A moon is a natural satellite that orbits a planet and in the odd case, asteroids At the Harvard Smithsonian center of astrophysics in Cambridge, a study on samples of the Earth's moon discovered that the rock is made of traces of oxygen, magnesium, aluminum and silicon. Sadly, this proves that our moon is not in fact made of cheese. The Galilean Moons consists of four moons that orbit Jupiter. These moons are called Io, Europa, Ganymede, and Callisto. They were discovered between 1609 and 1610 by a man named Galileo Galilei. The moon is Earth's only natural satellite and the fifth largest in the solar system. The moon is a cold, dry orb whose surface is covered with craters, rocks and dust. Earth's moon has no atmosphere. Recent lunar missions indicate that there might be some frozen ice at the poles.

The moon orbits the Earth in a phase locked orbit like Jupiter's Galilean Moons. This means that the same side of the moon is constantly facing our Earth, and we have never seen the other side of the moon from Earth. What are the Galilean Moons? When Galileo discovered the moons, it was still believed
that the Earth was the center of the solar system. When he saw the moons orbiting something other than the Earth, it brought up the possibility that maybe, our world, is not the center of the universe. This later lead to the discovery of the Sun being the center of our solar system. Why are they important? Ganymede is the largest satellite in our solar system. It is larger than Mercury and Pluto, and three-quarters the size of Mars. If Ganymede orbited the sun instead of orbiting Jupiter, it would easily be classified as a planet.

Ganymede has three main layers. A circular core of metallic iron, a shell of rock surrounding the core, and a shell of mostly ice surrounding the rock shell. The ice shell on the outside is very thick, maybe 800 km thick! Though it is mostly ice, the shell might contain some rock as well. Fact: Io has many peeks most of which are taller than Mount Everest Europa is the sixth closest moon to the planet Jupiter, and the smallest of its four Galilean moons. Still, it is one of the largest moons in our solar system. Europa is a bit smaller than the size of our moon.

Like the Earth, Europa is thought to have an iron core, a rocky layer around that and a surface of salty water. However, this ocean is covering the entire moon, and being far from the Sun, is frozen year round. This moon is one of the few places where scientists suspect there could be life forms. Callisto has an extremely thin atmosphere of carbon dioxide. Callisto has the lowest density of the four Galilean satellites.
Astronomers believe it has a crust about 200 km thick. They also believe that beneath this crust may exist a salty ocean. Callisto's core is believed to be composed of compressed rock and ice Astronomers have found at least 146 moons orbiting planets in our solar system. This number does not include the six moons of the dwarf planets and tiny satellites that orbit some asteroids and other celestial objects. Another 25 moons are awaiting official confirmation of their discovery. Out OF This World!!! Jupiter has many moons. Currently, Jupiter has 50 confirmed, and 16 provisional moons. 4 of the 50 confirmed, and the largest of Jupiter's moons are called the Galilean Moons. All the Galilean Moons orbits are 'phase locked' meaning the same side of the moon is always facing Jupiter. Earth centered solar system Sun centered solar system Earth's Moon Bet you didn't know that... Without the moon we would be rotating at much higher speeds with our days only being 6 hours long! This would have caused major effects to the Earth, killing most forms of life at their birth – possibly without the moon there could have been no life on Earth. Our moon was first walked on in
1969 on June 20th, by a man named Niel Armstrong. This was one small step for man, and one giant leap for man kind and our understanding of the moon. Question! How many moons are there in our solar system? 146 confirmed moons 6 orbiting dwarf planets, some tiny satellites around asteroids, and 25 still awaiting confirmation How many Galilean Moons are there? There are 4 Galilean Moons (Callisto, Io, Ganymede, Europa) According to scientists, which moon is most likely to sustain life? Europa

By: Cassandra Layton & Andrea Lee
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