How is planet earth made?

Answer 1

About 5 billion years ago our Solar System did not exist at all. Instead there was in its place a large cloud of gas and dust called a nebula. Over many millions of years the immense gravity of this large cloud caused the dust and gas to slowly fall inward towards its center.

As matter in the cloud fell towards the center it began to spin. The basic laws of motion cause this spinning. Objects in space do not speed up, or slow down unless their speed is changed by something else. Also all objects move in the same direction until their path is changed by something else. As the dust and gas fell into the center of the cloud each particle resisted slowing down, or changing directions. However the gravity of the growing matter in the center tried to pull the particles directly to the center. The strength of the gravity was not enough to pull the particles directly in, but it was strong enough to bend their paths around into a circle. As the cloud began to swirl it also flattened out, much like spinning a lump of dough on your hand causes it to flatten out into a Pizza crust.

Now we have a flat spinning cloud of dust and gas.

The center continued to collect more and more matter growing larger and larger. At the same time smaller clumps of matter began to form throughout the disk. These smaller clumps would eventually become planets, moons, asteroids, and comets.

As matter collects into clumps it heats up. The more matter, which collects the hotter, an object becomes. The Earth is still very hot in its core; this heat is left over from when the Earth originally formed. Eventually the Sun became so hot in its core that it ignited, turning hydrogen into helium. Once the Sun ignited the formation of the Solar System quickly ended. The new stars intense radiation and solar winds blew away the remaining dust and gas in the cloud so that the Sun and its planets could not grow any larger.

The planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called the terrestrial planets. They are small dense rocky planets. The outer planets (Jupiter, Saturn, Uranus, and Neptune) are called the Jovian Planets. They are large and made up of gas. Pluto is closer to a comet than a planet.

Answer 2

It all started with a tremendous bang. Somewhere in our galaxy a star exploded, throwing out masses of gas and dust. This supernova, as these explosions are called, happened about 5bn years ago. The wreckage from the explosion then crashed into a nearby cloud of gas, bringing together the ingredients for our solar system to form.Because the explosion was so energetic it made the dust mixture very hot and things began to cook. Little bits of dust began to cluster, making bigger and bigger lumps, and the mixture began to pull together under its own gravity.Eventually the central lump became so hot and dense that it started to generate its own energy, igniting nuclear fires. This was the birth of our sun. The remaining dusty mixture swirled around the star, fanning out into a disc.Gradually the sun grew in size and the dusty disc cooled. Over millions of years the dust clustered into grains, then lumps, boulders and eventually planetesimals - chunks of rock big enough to have their own gravitational field. Some of these planetesimals became the embryonic forms of the planets in our solar system today.Slowly these rocky planets began to organise themselves, settling at a comfortable distance from the sun and finding their own orbit. Earth found its path as third planet from the sun. In the early days rocky pile-ups were still common, leaving craters on the surface of all of the planets.One of these collisions, about 4.5bn years ago, is thought to have very nearly destroyed the Earth, and was probably responsible for our moon. A large planetesimal, about the size of Mars, gave Earth a glancing blow, chucking a chunk of Earth's crust out into space. Some of the planetesimal merged with Earth, while the ejected lump started its own orbit around Earth and became the moon.Evidence for this theory comes from samples of moon dust, showing that the moon is made of fairly similar rocks to those found in the upper layers of the Earth's mantle and crust.The moon formation crash knocked Earth sideways, changing its angle of tilt to the sun from 0 degrees to 23.5 degrees. As a result, the Earth started to have seasons: winter for the hemisphere tilted away from the sun, and summer for the hemisphere tilted towards the sun.Early Earth was a very different place to the planet we inhabit today. Initially the planet didn't have a crust, mantle and core, and instead all the elements were evenly mixed. There were no oceans nor continents and no atmosphere. Meteorite collisions, radioactive decay and planetary compression made Earth become hotter and hotter. After a few hundred million years the temperature of Earth reached 2,000C - the melting point of iron - and Earth's core was formed.At this point much of the Earth was molten and there may have been a magma ocean at the surface. Gradually the Earth cooled and the planet settled out into a core, mantle and crust. This layering of the planet helped to trigger plate tectonics at the surface, and the Earth began to look a little more like the planet we know today.Most geologists think Earth's atmosphere and oceans arrived about 4bn years ago - the product of multiple volcanic burps. Alternatively, they may have come from comets colliding with Earth and releasing water and gases at the surface.However they arrived, Earth's position in the solar system was serendipitous. Mercury and Venus are too close to the sun, so too hot for oceans to form (they just evaporate), while Mars is too far away (any liquids just freeze). Only on Earth were conditions just right.Earth's early atmosphere didn't contain much oxygen and was very different to the one we have today. Nonetheless, the atmosphere and oceans enabled life to get a foothold, and the first single celled organisms evolved about 4bn years ago.Gradually these algae changed the composition of Earth's atmosphere, munching their way through carbon dioxide and water, and releasing oxygen. By about 2.5bn years ago significant amounts of oxygen had built up in Earth's atmosphere. The scene was set for complex life to evolve.
rocks bine together to create planets

Answer 3

the earth was formed when the solar nebula (aka a giant dense cloud of spinning gases) began to form our solar system. eventually, all of the matter in the solar nebula began to form the various stars and planets. the planets were specifically formed when matter in the solar nebula collided and stuck together to form planetismals (first stage of planet formation), protoplanets (second stage of planet formation), and then finally, planets themselves (final end stage). the earth was formed in this same way.

Answer 4

According to most well known tremendous theory, The Big Bang, all the universe came into being through this.

The Astronomical objects (celestial bodies) where also formed.

In Einstein's theory of Relativity, it is proved that when the Big Bang happened the space, time and energy were formed.

Answer 5

God made the outer planets, the whole universe and everything in it. He made you and created everything in outer space.

Answer 6

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