STARS IN THE SKY
You can see at night billion of stars populated the universe in different colors. They are classified by the type of light rays that they emit and the kind of color as their radiated energy. The red dwarf stars are energy misers. A faintest star has a diameter of only 3% the size of the sun and faintly emits as much energy.
There are a wide variety of orange, white and yellow stars with different degree of mass and brightness. A yellow star with a radius under a million miles generate its energy from the sun in the visible part of the spectrum. A hot blue star are predominantly ultraviolet. The smaller red star unable to support any reasonable biosphere because on an inadequate supply of visible light.
In the solar system, the multiple star groups into two’s, threes or even more. Alpha Centaur, the nearest star to the sun, comprised 3 stars. Sirus A is the brightest star in the sky. It has twice as hot as the sun and roughly 1-1/2 times in diameter.
a binary stars are so close that their attraction to each other can cause huge eruption of tidal gas passing back and forth. Other binaries vary in their light because they are periodically eclipse to one another. Another class of variable stars undergo periodic fluctuations in their brightness without the help of an eclipsing partner. Some of them are quick-blinking having an intervals of flare-up intervals of only a few hours duration. This variations believed to due to the production of panting action due to the expansion and contraction of the star’s skin.
While stars may vary radically in size and the amount of light they radiate, they all follow similar patterns of aging and development. All of them are essentially giant nuclear furnace that generate energy by converting hydrogen into helium. But as an energy source, stars have only a limited amount of fuel. as it burns, the star is continually depleting its stocks of hydrogen and at the same time building up a deposit of helium ash.
