Moons- Facts and Info

        All planets, except for Mercury and Venus, have moons. Like the planets themselves, the moons are very unique objects. Our moon—the Moon—is similar to the terrestrial planets in composition and structure. Its diameter is about one-fourth of the diameter of the Earth. Many people most of the times think that moons are usually smaller than known eight planets but is not true. There are several moons in our Solar System orbiting planets which are larger than planets like Mercury and Pluto. Moons are also exciting just like planets. Our moon has no atmosphere and its surface is heavily cratered by meteoroid impacts, like the surface of Mercury. The Moon is thought to have formed when a Mars-sized object smashed into the forming Earth billions of years ago. Material was blasted into orbit around Earth by this collision, and later pulled together by gravity to become the Moon. The Moon is the only celestial body to have been visited by humans (instead of just by robotic spacecraft). Moons are also known as natural satellites. 

        Proper definition of moon is:-

        “A large round (nearly round) object that precisely revolves around a planet due to planet’s gravity like Earth’ moon (mostly known as Luna)”

        Mars has two moons, Phobos and Deimos. They are small objects that probably were captured by Mars at some point in the past, though it is not certain exactly how it happened. The Jovian planets have large families of moons; the largest of the moons have been known for decades or even for centuries. Italian astronomer Galileo Galilee (1564-1642) discovered the four largest moons of Jupiter in 1610. The moons discovered by Galileo Galilee are Io, Europa, Ganymede, and Callisto are now called the Galilean moons in honor of their discoverer. The Galilean moons are all different in almost every perspective. Io is the volcanic body with the volcanic activity caused by Jupiter’s strong gravitational forces. Europa is covered by ice, and underneath may be a global liquid water ocean. Ganymede is the largest moon in the Solar System. In fact, it is larger than the planet Mercury. Callisto is a little smaller than Ganymede. Both Ganymede and Callisto are covered with craters. In order to get a clear answer to ‘how many moons are in the Solar System, we first of all have to narrow our scope to the number of moons revolving or orbiting accepted planets and within that clear scope, we can say that there are about 166 known natural satellites in our solar system.

        Saturn’s moon Titan, the second largest moon in the Solar System and it has the only moon with significant atmosphere. More likely, its atmosphere is great attention to scientists, because Titan thought to have compounds most likely similar to those in Earth’s early atmosphere, long before the start of life changed the atmosphere on Earth.

        Neptune’s moon Triton also has an atmosphere like Saturn’s moon Titan, but it is a lot thinner than Titan’s atmosphere. Triton orbits Neptune during a direction opposite to the planet’s rotation—this suggests that Triton didn't form near the planet (according to however moons are thought to make around planets, the moon would then orbit within the same direction as the planet rotates).Instead, it may have formed elsewhere and was captured by Neptune’s gravity at some point in the past.

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