How did the Moon Form
Model of Moon Formation
There are wide explanations about formation of Moon in past years. It has been assumed that moon is a piece of earth that got divided due to centrifugal force. Moreover, these types of theories had various issues. The most common and acceptable evidence for the moon formation is known as Giant Impact Hypothesis. The moon was formed from debris that was resultant of big collision according to the hypothesis model. A planet having size equivalent to that of mars (called as Theia) smashed to the earth at relatively low angle and less speed after formation of earth. This strong hit by the planet made the entire earth a molten one and lead to huge amount of its crust and mantle blown directly into space. The metal part due to this huge impact or sunken through the mantle of earth resulted into fusion with core of earth and hence, lead to depletion of metallic Moon and finally made unusual explanations about its composition. The strong force due to collision has been made responsible for tilt of earth at 23.5 degree of angle and this tilt has been a reason for different seasons throughout the year. The debris part from the collision started orbiting the planet Earth and moved together through gravity to from a spherical structure called as Moon.
Facts of Giant impact Hypothesis Model
The formation of Moon was quick and took less than 30 days. It began getting close to the earth and might have caused huge tides. Due to angular momentum, it moved further from the earth until it got the known orbit like as of now. These days Moon is moving away from the position of Earth and will take around billions of years to escape completely from the Earth’s gravity. There are still some issues which need to be resolved with Giant impact Hypothesis. The ratios of volatile substances of the Moon have not been explained by the hypothesis model. There is other fact which this model fails to explain and it is isotropic ratios of oxygen of moon which can be similar to the earth when they are regarded as distinct.
The Giant Impact Hypothesis model has been considered as latest and most trustable evidence and carries more weight age than other theories made responsible for the formation of Moon. The total distance between Earth and Moon is about 384,000 kms.The total diameter of the Moon is around 3477 kms.The mass of Moon is about one eightieth of the total earth’s mass. The Moon orbits around the Earth at a speed of 3800 kms per hour. The gravitational force of Moon on the earth leads to rise and fall of tides in oceans.