Some unknown facts about stars in the sky

 1) What are the stars in the sky?

A:- A star is a ball of gaseous matter. This heat is so great that the gas inside the star burns and makes the star appear bright.

2) What is the temperature of stars?

A:- Stars range in temperature from 2,100 degrees Celsius to about 50,000 degrees Celsius.

3) How do you know how bright a star is?

A:- The color of the star is the indicator of its warmth. White stars are hotter than red stars. And
stars that are brighter than these appear bluish.

4) What is the nebula?

Ans:- Huge cloud of dust and gas which is formed by condensation is called nebula. Like vaporized
gaseous grains these nebulae are actually the births of stars.

5) What gas is there in the stars of the sky?

A:- Stars are mainly masses of hydrogen and helium gas.

6) Where does the heat and light of stars originate?

A:- Like hydrogen bombs, nuclear reactions in the cores of stars produce heat and light.

7) What is the temperature at the center of stars?

Ans:- The core temperature of stars is about 1.6 million degree centigrade. A grain of sand heated to this temperature can kill a person 150 kilometers away.

8) What is the state of all the substances in the hot stars?

Ans:- All the matter in the hot star is in the plasma state i.e. in the state where the electrons are separated from the atoms.

9) Why do we see twinkling stars?

A:- The density of the Earth's atmosphere is constantly changing due to the flow of air. We see
stars twinkling because the light from the stars passes through the Earth's atmosphere.

10) What reaction takes place in the center of stars?

A:- At the center of stars four hydrogen nuclei collide to produce a helium nucleus. This is the nuclear fusion reaction.

11) How is a stars-shaped judged?

A:- Astronomers calculate how big a star is from luminosity and warmth. The size and brightness of a star depends on its mass.

12) What type of star is the sun?

A:- Our sun is a medium sized star. There are no other stars in the universe that are more than 100 times the mass of the Sun or less than 6-7 percent of the Sun's mass.

13) What is the temperature of a blue star?

A:- Supergiant blue star that Papis- its surface temperature is about 40,00 degree centigrade.

Life cycle of a stars :-

1) Gases and dust collect.

2) From a hot core and created a new stars.

3)Like our sun, shines for 10 billion years. this cools to a red giant.

4) Which leaves a smaller.

5) Hotter white dwarf.