Stars are extremely important for galaxies and their different characteristics, since they determine the very history of galaxies. To a large extent, they are responsible for both the manufacture and the distribution of heavy elements such as carbon, nitrogen and oxygen.
We have all seen that, while it rains there is sun, somewhere in the sky a magical and wonderful spectacle is formed. The Rainbow". This is formed by the decomposition of white light into its primary colors when passing through a prism, in this case the raindrops. This is the "visual spectrum" and we can also see it on one side of a CD-ROM, on the sides of a crystal and in a waterfall
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The speed of light is the maximum speed that can be reached in the Universe, and is handled as a constant value, corresponding to 299,792,458 meters per second, which is usually approximated to 300,000 [km / s.
The shooting stars (or meteors, which is the same) are small particles (usually between a millimeter and several centimeters) that when entering at high speed in the Earth's atmosphere are "burned" by friction (actually the brightness is it owes to the ionization of the air around it) and they produce the luminous trace that quickly crosses the sky and which we call a shooting star.
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Its appearance is very varied. They can shine a lot or little. His career may be short or long. Some may leave a trail a few moments and others may not. Normally they are quite fast (they disappear before we have time to say it!) But there are also slow ones, which can last several seconds. Sometimes they can show some color: reddish, greenish, bluish, etc. according to the chemical composition of the meteor.