The Earth in the Solar System short notes

What are Celestial bodies? 

• Sun, moon, stars, planets, and all those bodies which shine or are visible in the sky during day or night are called celestial bodies.

What are the Stars?

• The celestial bodies which have their own heat and light, which they emit in a large amount of energy are called Stars. For example, our nearest star is the Sun.

What are constellations?

• The various shapes or patterns formed by different groups of stars are called constellations. For example, Ursa Major or Big Bear, Saptarishi, or the Group of Seven Stars are examples of constellations.

What are the planets?

• Some celestial bodies do not have their own heat and light and are illuminated by the light of the stars or get energy from the stars and revolve around the stars, such bodies are called planets. For example, Earth, Mars, etc.
• Our star, the Sun, has eight planets.

What are Asteroids?

• Those celestial bodies which are apart from stars, planets, and satellites and which revolve around the Sun are called asteroids. Asteroids are found in our solar system between Mars and Jupiter and their number is in millions.
• Asteroids are fragments of planets that have been separated by the explosion of planets.

What are Meteoroids?

• The small pieces of rocks that revolve around the Sun are called meteorites. Sometimes these meteorites come near the earth and enter the atmosphere and due to the friction of air molecules in the atmosphere, they get heated and burn, as a result of which light is produced from them.
• Sometimes meteorites do not burn completely and form craters when they fall to Earth.

Our Solar System:

• The Sun is the center of our solar system. It is made of extremely hot gases. Nuclear fusion is the ultimate source of Sun energy generation. The ultimate sources of heat and light of our solar system are Sun.
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• The Sun, eight planets, satellites, and some other celestial bodies such as asteroids and meteoroids form a solar system.

All the planets of the solar system move around the Sun in a fixed path are called Orbits.

Tricks to remember the eight planets in sequence order from Sun:
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M: Mercury
V: Venus
E: Earth
M: Mars
J: Jupiter
S: Saturn
U: Uranus
N: Neptune

Which is the twin planet of Earth?

• Venus is considered to be Earth's twin, the size of both is largely equal.

Which planet has more moons?

• Saturn has the largest number of moons.

Which is the biggest planet?

• Jupiter is the largest in size among all the planets.

Which is the smallest planet?

• Mercury is the smallest in size among all the planets.

Why does the earth appear blue?

• Two-thirds of the Earth's surface is covered with water, so the Earth appears blue from outer space.

Why is life possible on Earth?

• The earth is neither too hot nor too cold. Water and air are also present on the earth which are very essential for survival.

Moon:

• Earth has only one satellite, which is the Moon.
• Its diameter = 1/4th of the diameter of the Earth.
• The distance from Earth is 3,84,400 km.
•  It takes 27.3 days to make one revolution around the earth.
• There is no water and air on the moon.
• Its lunar surface has mountains, plains, and depressions. They cast shadows on the surface of the Moon.

What is the galaxy?

• The galaxy contains billions of stars, clouds of dust, and gases.
• Our solar system is part of the Milky Way galaxy. In ancient India, we call as "Akash Ganga" or " the river of light".

What is the universe?

• The universe is made up of millions of galaxies. It is also very difficult to imagine how big the universe is.

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