Earth – Overview

An Overview – about Our Earth in the Solar System

We only have one home – yes that is our earth. Let us know something more about it than what we know now.  It is the third nearest planet to the sun and fifth largest planet in size.

Facts that Matter about Our Mother (Earth)

  • Average Temperature – 22 Degree Celsius
  • Distance of the Earth from the Sun – 150 Million km
  • Earth Diameter – 12,756 Km
  • Length of a day – 24 hours
  • Length of year – 365.25 days
  • Natural Satellite – One (Moon)

In our Earth’s surface 71% is covered with water and the rest 29% is land which includes continents & islands etc. Well popular Japanese proverb says, “Day has its eyes, night has its ears”. Yes most of us would love, listen, and dream in nights due to its elegant nature. What makes our earth more beautiful? The Stars, Sun, Moon, Pole Star and Constellation not this alone much more are there.

Do you know?

Earth Twin Planet: Venus is considered as Earth’s Twin because of its size and shape which are very similar to that of the Earth.

Largest Planet in our solar family: Jupiter.

Smallest Planet in our solar family: Mercury.

Planets bigger than the Earth: Neptune, Uranus, Saturn and Jupiter.

Planets smaller than the Earth: Mercury, Venus and Mars.

Why earth is called unique planet, blue planet?

Unique Planet

  • It has suitable temperature for life. It is not too hot and not too cold.
  • If has filled with 71% of water. No other planet has water which is essential for survival of both living and non-living things.
  • Life giving oxygen is only found on the Earth.
  • Ozone layer protects all organisms from the harmful sun rays.

Blue Planet

From the space, Earth looks like blue because it’s 2/3rd of the surface covered by water. It appears blue from the outer space and is called blue planet.

The Family – Solar System

A solar system is consisting of Sun, its planets, satellites, asteroids, meteoroids and other objects that orbit around the sun.

Celestial Body: All the heavenly bodies like the sun, moon, stars, earth, etc or other objects in the universe but not on the earth are called celestial bodies.

Orbit: The planets and satellites which revolve around the Sun and the Planets respectively on the elliptical path are known as orbit.

Planets: A celestial body which revolves around a particular star in an orbit. It receives all its light and heat from that star. According to their distance from the Sun the planets are fall as below.

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Memory Capsule: My Very Efficient Mother Just Served Us Nuts

Is it Pluto is in this list? Yep, we know that it was in our solar system till August 2006. After which it was declared as a “dwarf plant” like Ceres and Eris.

Crown of Our Solar System (The Sun)

The sun is the only star which has its own heat and light which is called as a “Crown” of our solar system. It is made up of extremely hot gasses. It is in the centre of the solar system in which planets orbit around the sun.

Star: A celestial body which is very hot and big, and made of gasses, typically has its own heat and light is called stars.

Galaxy: The millions and millions of stars, planets, satellites, asteroids, meteoroids, forming galaxies. We are living in the Milky Way galaxy which is also called as Akash Ganga.

Universe: The cluster of galaxies together forms Universe. There is only one Universe, and everything that exists, exists in this Universe itself.

A Beautiful, Short lines about our Beauty (Moon)

The moon is the only natural satellite of our planet earth whereas other planets have few more; totally we are having 63 moons in our solar system. Its diameter is 1/4th of the earth’s diameter. Neil Armstrong was the first men who step on the surface of the moon on 21th July 1969.

“The moon, like a flower

In heaven’s high bower,

With silent delight

Sits and smiles on the night”

Our moon is such beautiful as like the above lines. We noticed that the moon appears in the sky at different times, in different shapes and at different points. It is 3, 84,400 km away from the earth.

Full Moon or Poornima: The moon shines in the form of a ball from the earth as a full sphere, it occurs once in a month.

New Moon or Amavasya: The fifteenth night after the full moon, when the moon is not visible at all in the sky.

Satellite: The celestial body which revolves around a planet in a particular orbit and do not have their own heat and light. Ex: Moon

Man made Satellite: Manmade satellites are carried by the rocket and set in the orbit of the Earth. Ex: INSAT, IRS, EDUSAT.

Why any living organism can’t live in the moon?

Even though it is such beautiful to look from the earth but we can’t live there because it does not have any conditions favourable for life of any living organism.

  • During the day it is very hot.
  • At night it is very cold.

Why we can see only one side of the moon surface always?

The revolution of the moon around the earth (27days) and rotation about its own axis (27days) takes nearly the same time. Hence one day of the moon is mostly equal to 27 Earth days. So only we are always able to see only one side of the moon from the earth.

Constellation: A pattern or group of several stars is called constellation. Ex, Saptrishi, Ursa Major.

Pole Star: The star shines over the North Pole and does not change its position and indicating the north direction. If a line is drawn through pointer stars always it points towards a pole star which is used to determine directions during the night. It remains same direction in the sky, throughout the year.

Satellite Vs Star Vs Planet

Satellite Star Planet
Not having own light and heat Having its own light and heat. It receives heat and light from the star.
Small in size. Very huge in size. Spherical in shape.
There are 63 satellites in our solar system. Sun is the only star in the solar system. There are eight planets in our solar system.
It is called as moon. It is called as Wanderer.
It revolves round its planet. It revolves round its galaxy. It moves around the sun.

Asteroids, Meteoroids, Geoid

Asteroids:  are small celestial bodies which revolve around the sun and are found between orbits of Mars and Jupiter. The largest asteroid is Ceres.

Meteoroids:  are tiny parts of rocks which revolve around the sun. When they come into the earth’s atmosphere, they started to burn.

Meteorite:  A huge burning rock, destroyed not fully and falling on the earth.

Geoid: A sphere with its ends flattened at the poles just like our earth.

Words and its meaning related to earth

Geology –Study of the earth’s interior

Geometry- Measurement of the earth.

Geoids- Similar to the shape of the earth.

Geophysics- the physics of the earth.

Geomorphology- the study of physical features of the surface of the earth.

Geography-the study of physical feature of the earth and its atmosphere, and of human activity it affects the earth.

The Sun and the Planets:

Celestial Bodies Revolution Time around the sun Rotation on axis No of moons
Mercury 88 days 59 days
Venus 255 days 243 days
Earth 365 days 1 day 1
Mars 687 days 1 day 2
Jupiter 11 years 11 month (nearly 12 years) 9 hours 56 minutes 16
Saturn 29 years 5 months 10 hours 40 minutes 18
Uranus 84 years 17 hours 14 minutes 17
Neptune 164 years 16 hours 7 minutes 8

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