HOW OLD IS OUR EARTH??
Scientists believe that our earth was formed approximately 4.54 billion years ago there was a massive explosion, which the scientists later named "The Big bang". It released radiation, particles and huge clouds of atoms, dust and gas. Our earth is believed to have been born as a result of this Big Bang.
Our earth is located at the spiral galaxy named the 'Milky Way' which is the part of the solar System. The solar system also consists of the sun, the Moon, the other seven planets and their moons, numerous comets, asteroids and minor planets. The solar system was formed from large, rotating cloud of interstellar dust and gas called the " solar nebula", orbiting the Milky Way's galactic center. The solar nebula was composed of hydrogen and helium, created shortly after the big bang.
HOW DID THE EARTH FORMS?
After the big bang, particles were floating around in space. The force of gravity pulled the particles together and they began to spin around a centre. Some of the matter squeezed into a tiny fire ball, which grew bigger and bigger, until it gave birth to the sun. The rest of the molecules kept spinning in a cloud of dust that was left over from the formation of the sun. In time, a few molecules clumped together. Then, the clumps began to crash into each other and stick together to make bigger clumps. Finally, there were huge clusters of metal and rocks, hundreds of miles across, good enough to be called planets. One such cluster is our planet earth. Its formation was largely completed over 10-20 millions years.
WHAT DID THE JUST -BORN EARTH LOOKS LIKE??
The just-born earth was like a blurred patch of blistering rock and chocking fumes. However, space was cold so the earth also began to cool down. Approximately, 3, 000 million years ago, the planet was cool enough for land masses to form. The centre of planet was mainly melted iron. As time passed, the surface cooled to form the crust, which was mainly silica and the steam condensed into water.
HOW DID THE EARTH START ORBITING THE SUN??
The sun's gravity caught the earth, as well as other planets, and pulled them into an orbit around the sun. On one hand, the earth's momentum was always trying to carry it away from the sun in a straight line. On the other hand, the sun's gravity kept pulling the earth toward the sun. As a result, because of the centrifugal force, the earth ended up orbiting the sun in an elliptical path.
HOW FAR IS THE EARTH FROM THE SUN??
The earth is the third planet from the sun. It is situated at an average distance (the mean distance) of about 150 million kilometers (93 million miles) from the sun. However, the exact distance between earth and the sun varies with its position in its elliptical orbit.
WHEN IS THE EARTH CLOSEST TO THE SUN??
The earth is closest to the sun around the first week of january, every year. The event is called perihelion, and at this point, the distance between the earth and the sun is about 147 million km (91.3 million miles).
WHEN IS THE EARTH THE FARTHEST FROM THE SUN??
The earth is the farthest from the sun around the first week of july, every year. The event is called Aphelion, and at this point, the distance between the earth and the sun is about 152 million km (94.4 million miles).
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