There are a lot of astronomers that think that a star begins as a dense cloud of gas in the arms of spiral galaxies. Individual hydrogen atoms fall with highly increasing speed and power or "enery" toward the center of the cloud under the force of the star's gravity. This increase in energy heats the gas. When this process has continued for a few million years, the temperature reaches about 20 million degree fahrenheit. At this temperature, the hydrogen within the star lights on fire and burns in a continuing series of nuclear reactions. The onset of these reactions marks the birth of a star.



Red giants have diameter's between 10 and 100 times that of the Sun. They are very bright because they are so large, although their surface temperature is lower than that of the Sun. A White Dwarf is a very small, hot star, the last stage in the life cycle of a star like our Sun. White dwarfs have a mass similar to that of the Sun, about the size of the earth, which is 1% our sun. The surface temperature of a white dwarf is 8000C or more.


A star is a luminous globe of gas producing its own heat and light by nuclear reactions. The brightest stars have masses 100 times that of the Sun and emit as much light as millions of Suns. A Red Giant is a large bright star with a cool surface. It is formed during the later stages of the evolution of a star like the Sun, as it runs out of hydrogen fuel at its centre. Red giants have diameter's between 10 and 100 times that of the Sun. They are very bright because they are so large, although their surface temperature is lower than that of the Sun.

I don't really have an opinion on anything like this. The closest star near us is our sun and that looks like its still in its pubesent years, so no fears then. I'll be worried when our sun starts to look a little different in the size and color area or when scientists say something. Until then, I'm not going to worry about anything silly like a black hole sucking me up.