Every star that has ever shined, and that ever will, started its life inside a vast interstellar cloud of dust and gas called a nebula. Within the nebula, individual molecules of gas begin to shrink. As the density of these molecules become denser, they grow hotter. We know this because the fundamental laws of physics tells us that a collection of atoms will raise its temperature when it is contracted into a smaller volume. The contraction was slow at first, only heating the gas in the cloud to temperatures of a few hundred degrees, but as the clouds shrank in size, the temperature of the compressed gases slowly increased up to thousands of degrees. When a nebula becomes this small and hot the atoms move so rapidly and close together that they collide. When these atoms collide, the electrons are knocked loose of the nuclei. This occurs until the gases only contain free roaming

One type of star is called the red giant. Red giant stars are the largest stars in the universe known to man at this point in space exploration. They are about four hundred times the size of our sun. As a star ages, its core shrinks down to a much smaller size than before. Because of the stars self-gravitation, it also grows denser. The core contracts because of the small supply of protons. To produce the same amount of nuclear fuel, the star heats its remaining protons more than usual, so the rate of nuclear fusion is greater than before. This causes the star to generate a greater supply of energy then it even did with its greater supply of protons. In actuality, the star is like a motorcyclist racing to the next gas station so he won't run out of fuel. Thus causing the remaining fuel to be burnt at a much greater rate.

Many questions about stars have been already answered, but there is still so much that we don't know. Such as what are black holes? This question, and many others like it may be answered in the near future, as space exploration continues, and our understanding of the universe expands.

The temperature of a group of particles measures the average energy of motion per particle. When the temperatures are high, particles dance randomly. But when the temperature is lower, this means that the particles velocities will be more modest. The higher the self-gravitation within the star, the higher the temperature.

After a star goes nova, the star can shrink down into a pulsar. Pulsars are believed to be neutron stars. Unlike normal radio waves received from stars, pulsars waves come in bursts or pulses. Scientists believe this is due to rotation. Because pulsars are so dense, they can rotate very rapidly. On pulsars there may be a hot spot which may give out more light and radio energy than the rest of it. Thereby causing it to send pulses of light and radio waves into space.

Some scientists believe that there are massive stars that are up to one thousand times the size of our sun. These stars, which have never been seen, would be more massive than any other star known to man. Scientists are still searching the sky's for evidence of the existence of these stars.

Scientists believe that when a very large star dies, the resulting star may become more dense than even a neutron star. This is called a black hole. The gravitational force in these stars not only crush atoms into neutrons, but crush neutrons into an even denser material. A marble sized piece of this matter would weigh billions of tons here on Earth. The matter in these stars are so great that it pulls everything into it including: all matter, heat, light, X rays, radio waves, and any other form of energy. Because of this, no black hole can be seen or detected by scientists using any type of equipment.

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Approximate Word count = 2018
Approximate Pages = 8 (250 words per page double spaced)