Question

short summary of the chapters 1) stars and solar system 2)Light 3)Friction...plz help me out...

Answer 1

solar system is having 8 planets and it is infinite big and large

Answer 2

1)A huge ball of gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the starglow. ..solar system-the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
2)Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. 
3) the resistance that one surface or object encounters when moving over another.