Gravitational forces from both the sun and moon continuously pull on the Earth. It is the moon's gravity that is the force behind the Earth's tides. Every particle on Earth is pulled on by the gravity of the moon. Because liquids move more easily, the pull of gravity is much more noticeable in liquids than in solids. The moon's pull is strongest on the part of the Earth directly facing the moon.
4 outer planets become large enough to accrete dust and gas forming gas giants or 2.. instabilities in the cooler region of solar system cause a collapse of initial interstellar cloud. Random: Kuiper Belt lie beyond Neptune, close to ecliptic, also where most comets(originate from oort cloud) orbit. denser planets are closer to sun, Saturn can float, in differentiated bodies denser materials lie near core, density=mass/volume. Auroral happens due to solar winds displaced poleward by magnetic field. Deepest depression= Mare Crisium on moon.
Gravitational Force of Bodies All bodies with mass exert a gravitational pull on the bodies around them, even you and me. The larger the radius and mass of the body the larger the force. Most people know that the force of gravity on earth is much greater than on the moon, but how much larger is it, and how is gravity calculated? German astronomer Johannes Kepler (1576-1630) spent years observing the motion of planets and developed a set of laws for planetary motion. Years after his death Physicist Isaac Newton (1642-1727) used these laws to help him develop his law of universal gravitation.
The moon also affects the length of day. With the moon’s gravity constantly pulling on Earth, the earth’s rotation slows down dramatically. This is what gives us our twenty four hour days. If we did not have the moon, Earth would spin fast giving us only eight hour days! That would mean only three to four hours of sunlight per day!
There are also four outer objects which are use to serve as the gas giants. Each of outer planets such as Jupiter, Saturn, Uranus, and Neptune were encircled by planetary rings of dust and other particles. Lastly, the farthest of all is that the gray in color sphere which is said to be the Pluto. Let’s observe and look all around us! Looks like a real solar system.
It has a metallic core which makes up 75% of the planets radius. Radar images taken indicate that the core of mercury is in fact liquid and not solid like earth’s core. The core of mercury has an abundance of iron, much more iron than any other planet. This iron generates a magnetic field around the planet, only one precent as strong as Earth’s magnetic field. This field is said to be active and frequently interrelating with the solar wind and channelling plasma into Mercury’s surface from the sun.
Only the rate at which other objects spin around it. A more massive planet requires that a moon be traveling faster to keep it in orbit. Anything slower would "fall" into the planet. The heavier the planet, the faster the object needs to be to stay in orbit. Here is an example: On Earth, an object needs to be travelling at roughly 18,600 miles per hour to stay in orbit.
The closer the planet is, the faster the speed. Third law establishes a relation between the average distance of the planet from the sun and the time to complete one revolution around the sun. The ratio of the semimajor axis is the same for all planets including earth. Issac concluded the attractive force exsiting between any two particles of matter is defined as gravitation. Sir Issac fully recognize the force holding any object to the earth is the same force that holds the moon, planets, and other heavenly bodies in their orbits.
The Geology of the Moon Approximately 4.5 billion years ago a large asteroid struck Earth and thus resulted in the Moon. This impact theory suggests that the collision ejected raw materials which in time became the Moon. With the Moon having no significant atmosphere, it can reserve a good record of the impact history. This information can provide geologists with clues to the history of the Earth. The crust of the Moon is composed of a variation of primary elements, including uranium, oxygen, thorium, potassium, silicon, magnesium, iron, titanium, calcium, aluminum and hydrogen.
Phobos will eventually crash into Mars or break up and form a ring around the planet. Deimos (which means fear) was named after the Greek God Deimos who was the twin brother of Phobos. Deimos is the outer moon so it is further away from Mars and takes about 30 hours to orbit. It is small and lumpy and has lots of craters and is covered in dust and loose rocks. Although it has many craters it’s surface is much smoother than Phobos’ Deimos has an average radius of 6.2