Finding the stars
When observing the night sky, is a restless spirit, the first question is: What is a star? A star is a big ball of hot gas and light, lest his own power held by the known nuclear reactions in the core center of the star produces reach to enormous temperatures, and appear as a luminous phenomenon that accompanies us on our observations of the night sky in a clear night.
Stars have a life like any living creature to be born, to develop and grow and grow and eventually die and disappear more or less violent as a supernova explosion, the process of the birth of new stars can cause the other.
The universe is a nearly infinite space with room for millions of stars, star clusters and galaxies. The distance from the Sun, the nearest star to Earth is the astronomical unit, AU – and is 149.59787 million km. The nearest star, the Sun is Proxima Centauri, and the emitted light takes 4 years to reach Earth.
Molecular clouds are huge and deep dark clouds formed by a gas called hydrogen (99%) and interstellar dust in a very small percentage (1%), but enough that under certain conditions, the stars can be born. One could say that this cloud has to provide the raw material for star formation.
The embryos of the future stars are hidden in molecular clouds, and only the emitted radio and infrared waves of the electromagnetic spectrum from embryos of the stars, through the dark regions – not visible light.
The birth of a star
Although the proportion of dust in the cloud material is small compared to the amount of gas, these clouds are so large that they can collect enough mass to produce thousands, even millions of stars like the sun
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