Question

The Sun and stars glow because of the presence of:
(A) Gas
(B) Liquid
(C) Plasma
(D) None of the above

Answer 1

The stars are the celestial object that are extremely hot and have the light of their own. The stars appear to be small because they are very far away from the sun. Moreover, the Sun is also a star which is nearest to the Earth.

Complete step by step answer:
The objects which exist in the sky are known as celestial objects. Basically stars are the celestial objects which have their own light and the Sun is also a star which is nearest to the Earth but it looks much bigger and brighter because it is nearer to us.
However, the stars are always present in the sky even during the day time but we are unable to see them because of the bright light of the sun and hence they are only visible at night due to the absence of sunlight.
Now, the basic reason for the glow of the sun and stars is due to the presence of plasma in them. It is basically the fourth state after solid, liquid and gas which consists of super energetic and super excited particles. In stars, the plasma is created because of very high temperatures.
Plasma is also present in the fluorescent tube and neon sign bulbs that we commonly use in our day to day life. The neon sign bulbs are filled with neon gas while the fluorescent tube is filled with helium gas. So, when the electric current flows through the gas, the gas gets ionized and creates a plasma that glows inside the tube or the bulb. However, the colour with which the plasma glows depends on the nature of the gas.

Hence, option C is correct.

Note:
A light year is a unit which is used to express the distance between the various celestial bodies. It is the distance travelled by the light in one year. Moreover, the distance between the Earth and the stars is very large. The stars are millions of times farther away than the sun (the sun is nearly 150,000,000km).