Life of the stars

Class: 4
Date: March 03/10
Item: Life of the stars
The stars are origins in the nebulous; it is a mass of cosmic gas.
A Stars is formed by helium (He); Hydrogen (h); in hot state.
Cycle of a life of a Star
All the stars have a life cycle; a star is it a mass of cosmic gas in hot state.
WHITE MIDGET

Are compound by atoms in plams state; it´s temperature is 200.000 C. Then it´s temperature down and the Stars becomes in a yellow mediats.
YELLOW MEDIATS
Is a big star; it has yellow color and it´s temperature is 5.000 C.
RED GIANT
Is a very big star; its mass down and it´s temperature too; it has around to 3.000 C; it´s nucleus is like a white midget star; and the helium exhausted.
SUPER RED GIANT
In astronomy, are called red super giants (red super giants in English) to super giants (of luminosity class I) of spectral type K or M. They are the biggest stars (in volume) found in the universe, although not the most massive and as its name implies, their surfaces are red.
The low effective temperature of these stars compared to that of the blue giants, as stated above, is because the density, ie the amount of mass in relation to the volume occupied by such celestial bodies, is very low, so you can also say that the density of red super giants is much smaller than the blue giants, the diameter of these stars is therefore very large, hundreds of times solar, or even much higher. The largest known red super giants in the Galaxy is VY Canis Majoris, VV Cepheid, KW Sagittarii, V354 Cepheid and KY Cygni, all with radio about 1,500 times the solar radius, or about 7 ua, and some even listed as red hyper giants . If they were in the center of the solar system, its surface would be between the orbits of Jupiter and Saturn, or even surpass the date of this planet.

NEBULA
Nebulae (singular nebula, nebulae plural in Latin and English) are regions of the interstellar medium consisting of gas (mostly hydrogen and helium) and dust. They have a significant cosmological importance because many of them are where stars are formed by condensation and aggregation of matter; at other times they are the remnants of stars that are already extinct.