Stars
A ball made up of plasma and luminous in nature is called a star. A group of stars are called galaxies. Earth’s nearest star is the Sun. This star is the greatest energy source on the earth. It also blesses us with the daylight. The other stars cannot outshine the sun and so they appear in the night when the sun is not visible. The star shines with its own light but there is some chemical formula to it. There is a fusion, nuclear in nature at its core and this vents the energy which travels the star’s inner part and flows back into the outer space. The elements heavier then helium and hydrogen were created inside the stars.
Looking at a star’s motion, luminosity and spectrum, the astronomers can find out the chemical composition, age, mass and other properties of the star. The properties and characteristics of a star are determined by their temperature, movement, rotation and diameter. The start is actually a combination of hydrogen and helium and trace elements. The core is dense and through nuclear fusion process, some hydrogen converts to helium steadily. The processes involved are convective and radiating processes that in turn produce a stellar wind and outer space.
