Every star has a story. Some are as old as time. Some are faint and almost forgotten. Others burn bright and end their lives in powerful explosions. New stars are created every moment, born of interstellar clouds of gas. Through every phase of their evolution, stars release the energy that lights the Universe. 

Featuring nebula, clusters, red giants, supernovae, pulsars, and black holes, Sky Show “Stars: The Powerhouses of the Universe” takes you a journey to the furthest reaches of our Galaxy and experience both the awesome beauty and incredible power of stars.

The life cycle of the stars begin in these nebulae. A nebula is a great cloud of gas and dust in the universe. Nebula may be formed from supernova explosion throwing out vast amounts of stellar materials into the space. Nebula could be extremely large and massive, up to thousand of light years in diameter and from 10 to 1,000 solar masses. The Great Orion Nebula and The Carina Nebula are examples of large nebulae. 

When interstellar cloud within a nebula contract by its own gravity, it may form a “protostar”. If the protostar is massive enough, the gas in the protostar continues to heat up until the central portion becomes hot and dense enough for nuclear fusions taking place, a star is born.

Our very own star, the Sun, is a typical star right at its meridian of life, also known as “main sequence”. The Sun is made mostly of hydrogen and helium with a surface temperature of nearly 6,000℃. Deep within its core, the temperature rises to 15 million degrees Celsius. Every second, nuclear fusion reactions convert more than four million tonnes of hydrogen into helium, releasing the energy that may keep on powering the Sun for the next five billion years. 

The brightest star in the night sky is called Sirius, which is also a main sequence star with an estimated surface temperature of 9,000℃. Sirius is about twice as massive as the Sun but its lifespan is only one hundredth of the latter one.

The explosive end of a star's life is one of the most awesome spectacles in the universe. When a massive star has exhausted most of its fuel, the core of the star would collapse dramatically. 
Incredible energy triggered by the core collapse will be released instantly and send off shock waves outwards and throw off the outer layers of the star. It is a “supernova” explosion. The brightness of a supernova can increase to more than one million times rapidly. 

SN 2006gy is the brightest supernova ever recorded, forming by the explosion of a monster star with mass about 150 times that of our Sun. SN 2006gy was not visible by naked eyes however, as it was not located within The Milky Way. It was located at a galaxy about 240 million light years away. Another famous remnant of supernova is the Crab Nebula which was formed by a supernova explosion in 1054. The Crab Nebula is still visible through a small telescope today. A vast interstellar cloud of gas left behind a supernova explosion. The new life of a star begins there.

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