Manual Fourth Planet from the Sun

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But in when Galileo first pointed a telescope at the sky he discovered Jupiter's four large moons Io , Europa , Ganymede and Callisto now known as the Galilean moons and recorded their motions back and forth around Jupiter.

In Roman mythology Mercury is the god of commerce, travel and thievery, the Roman counterpart of the Greek god Hermes, the messenger of the Gods. The planet probably received this name because it moves so quickly across the sky.


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Mercury has been known since at least the time of the Sumerians 3rd millennium BC. There are officially only eight planets in our solar system.

8. Mercury

Of course this change in terminology does not affect what's actually out there. In the end, it's not very important how we classify the various objects in our solar system.

Jovian planets

What is important is to learn about their physical nature and their histories. Our knowledge of our solar system is extensive but it is far from complete. Some of the worlds have never even been photographed up close. As the matter clumped together, gravity in that area got stronger which attracted more matter which in turn increased the gravitational pull.

Order Of the Planets From The Sun - Universe Today

As more and more matter fell toward the high density area, due to conservation of momentum it began to spin - rather like water going down a plug hole. The result was that as the gravity intensified, the spin became faster resulting in a flat disk of gas and dust surrounding a central high density sphere of gas. Gravity was also working within the disk of rotating gas and dust pulling matter together to form primitive planets within the gas disk.

Eventually the temperature and pressures in the central sphere became so high that the atoms began fusing together nuclear fusion and the Sun ignited producing heat and light and also the solar wind - an outstreaming of subatomic particles. The heat of the Sun and the solar wind immediately began to have an effect on the huge cloud of gas and particles in the disk.

Mars In The Fourth Position

Volatile substances such as water ice near the Sun would heat and sublimate into gas, and these and other gases such as hydrogen would be gently accelerated away from the Sun by the solar wind. At the distance of Jupiter, the temperature the Sun was not high enough to cause water ice to evaporate and so this meant that large quantities of solid material were available to build larger planets. These planets could therefore attract and keep hold of more of gas from the gas disk. This is one theory as to why the gas giants became so large, and why there is a divide in planet size between the small inner rocky planets and the outer gas giants.

The Planets in our Solar System:

As time continued, the workings of gravity and the solar wind eventually resulted in the solar system becoming as we know it today. A mostly empty space with eight surviving planets, five dwarf planets, a band of possibly millions of asteroids.


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  • All of this is thought to be surrounded by a cloud of icy comets - preserved remains of that early dust from which the solar system formed. The planets and dwarf planets are listed here in the order they are from the Sun. Click for more information on each. Flash animations copyright : Hayling Graphics.


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      Mars Diagrams Mars size compared to Earth.

      Mars Facts

      Facts about Mars Mars and Earth have approximately the same landmass. Mars is home to the tallest mountain in the solar system. Olympus Mons , a shield volcano, is 21km high and km in diameter. Despite having formed over billions of years, evidence from volcanic lava flows is so recent many scientists believe it could still be active.