1) A Star is born when an enormous cloud of hydrogen gas collapses until it is hot enough to burn nuclear fuel (producing tremendous amounts heat and radiation).
2) Stars (except for the Sun) appear as tiny dots in the sky; as their light travels through the many layers of the Earth's atmosphere.
3) The white star which we are seeing are as such big as Sun. There are larger groups of stars, called clusters.
4) Our universe likely contains more than 100 billion galaxies, and each of those galaxies may have more than 100 billion stars.
5) Yet on a clear, dark night Earth's sky reveals only about 3,000 stars to the naked eye.
6) Their brightness is a factor of how much energy they put out, which is called their luminosity, and also how far away from Earth they are.
7) Stars are cosmic energy engines that produce heat, light, ultraviolet rays, x-rays, and other forms of radiation.
8) All remaining mass of the star is crushed into a single point, or singularity, no larger than a single atom. Here's how a black hole is born.
9) A supernova is an exploding star. Supernovas contain at least thirty times more mass than the sun does. The gas circles through space in cosmic dust clouds called nebulae.
10) Star can die. First it can simply burn out of gases or it can happen by a supernova.
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