Chapter: Earth in the Solar System – Important Points
Universe
The universe consists of innumerable stars, planets, satellites, comets and galaxies.
It is infinite and continuously expanding.
Stars
Stars themselves emit light and heat.
The Sun is also a star.
Constellations
Groups of stars that appear in a particular shape.
Example: Saptarishi Mandal .
The Sun
The center of the solar system and the main source of energy.
All planets revolve around it.
Planets
Celestial bodies that revolve around the sun and do not give off light themselves.
There are eight planets:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Trick to remember: "My Very Educated Mother Just Served Us Noodles"
Earth
The only known planet with the presence of life.
Life is possible due to water, atmosphere and suitable temperature.
Earth is third from the Sun.
Satellites
Celestial bodies orbiting the planets.
The Moon is the natural satellite of the Earth.
Comets
are made of ice, gas and dust.
They appear with tails and shine brightly when they come near the Sun.
Meteors
Pieces of rock or metal falling from space towards the Earth.
They burn due to friction in the atmosphere and are called "shooting stars".
Galaxy
A huge system made up of stars, planets, gas and dust.
Our galaxy is called the Milky Way.
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