Stars and solar system from Mathesh T Stars and Solar System Class 8: Parts of Solar System Pluto did not fit into this definition hence it is no longer a planet of the solar system. In 2006, the International Astronomical Union (IAU) adopted a new definition of a planet. Till 2006 there were 9 planets in the solar system. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. There are 8 planets revolving around the Sun.
The gravitational attraction between the Sun and these objects keeps them revolving around it.
It consists of a large number of celestial bodies such as planets, comets, asteroids and meteors. The Sun and the celestial bodies which revolve around it form the solar system. The distance of Alpha Centauri is about 4.3 light-years which is the closest star to the planet Earth. Thus, the distance of the Sun from the Earth is said to be about 8 light minutes. The speed of light is about 300,000 km per second. It is the distance travelled by light in 1 year. The unit of measurement for large distances in space is known as light year. It looks like a distorted letter W or M Light years Cassiopeia is another prominent constellation in the northern sky. The three middle stars represent the belt of the hunter and the four bright stars appear to be arranged in the form of a quadrilateral. Examples of some constellations are – Ursa Major, Big Dipper, the Great Bear or the Saptarshi and Orion. Stars that form a group that has a recognizable shape is called a constellation. The moon does not produce its own light and we are able to see the moon because of the sunlight falling on it which gets reflected towards us. Some of these are as high as the highest mountains on the surface of Earth. There are many craters and a large number of steep and high mountains all of the different sizes.
The stars, planets, moon and the other objects in the sky are called celestial objects. The chapter explains about the celestial objects and the solar system and we have provided brief notes for this chapter below – Celestial objects Notice Writing for Class 8 Brief Summary of Stars and Solar System Class 8
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