Earth
This planet is the third planet from the sun, as known so far it's only planet with life on it. It formed 4,5 billion years ago and life appeared on Earth in the first billion years. This changed slowly due to a change in the atmospheric substances and like this the ozone layer was formed. Which blocked harming solar radiation. And this permitted living substances in the ocean to move slowly onto land. Earth is covered for over 70% with water and this is why it's sometimes called the "Blue Planet''. The planet's inside consists of a solid iron inner core, a liquid outer core(which creates the magnetic field) and a thick layer of solid mantle. One orbit around the sun(a year) takes 365,26 days. The Earth has got one moon, which regulates the tides of the ocean and slows the rotation of Earth. At the moment the Earth consists of seven continents, from largest to smallest: Asia, Africa, North America, South America, Antarctica, Europe and Australia. When the Earth came into existence all the continents were stuck together but when the planet became older, the planets started to move apart from each other. Scientists have found and named around 1.7 million species on Earth, which live in different habitats and are developed in other ways. The diameter of Earth is 12,756 km and a mass of 5,9742×10^24 kg. The most extreme temperatures ever measured on Earth are -88 degees celsius and +58 degrees celsius. The planet's atmosphere is build up from: 78,09% N2, 20,94% O2, 0,93% Ar, 0,04% CO2 and 1% water vapour.
Some interesting facts about the Earth are:
The Earth’s rotation is gradually slowing:
This deceleration is happening almost not measureable, at approximately 17 milliseconds per hundred years, although the rate at which it occurs is not perfectly constant. This has the effect of lengthening our days, but it happens so slowly that it could be as much as 140 million years before the length of a day will have increased to 25 hours.
The Earth was once believed to be the centre of the universe:
Due to the apparent movements of the Sun and planets in relation to their viewpoint, ancient scientists thought that the Earth remained in one place, whilst other planets and starts travelled in circular orbits around it. Eventually, the view that the Sun was at the centre of the universe was discovered by Copernicus and this was eventually shown to be the case.
Earth has a powerful magnetic field:
This phenomenon is caused by the nickel-iron core of the planet, coupled with its rapid rotation. This field protects the Earth from the effects of solar wind.
Earth is the only planet not named after a god:
The other seven planets in our solar system are all named after Roman gods or goddesses. Although only Mercury, Venus, Mars, Jupiter and Saturn were named during ancient times, because they were visible to the naked eye, the Roman method of naming planets was retained after the discovery of Uranus and Neptune.
Of all the planets in our solar system, the Earth has the greatest density:
This varies according to the part of the planet; for example, the metallic core is denser than the crust. The average density of the Earth is approximately 5.52 grams per cubic centimetre.
