The Star

What is a star?


Star is a huge sphere of gas. Star look very small because they're too far away from us but many of them are bigger and brighter than the Sun. The energy of the star are made in the middle by nuclear fusion. Star have different size and colors. Star are made of al big cloud of dust and gas called a steller nebula. When the star become to hot enough, the middle of the star can begin nuclear reactions so the star come to the new world.

Types of Stars?

Stars are classified in 4 different types. They are Super Giant, Giant, Main Sequence and White Dwarf. They are also classified in other 6 different categories, ages, size, names, temperature, luminosity, color and spectral class. White dwarfs are very old, small, white stars. They are very dim, which means that they are dying. Supergiant stars and main sequence stars can be any color and size. They all have different temperature, luminosity, and spectral class.

H - R Diagram

The H-R diagram is a graph that tells us a star's luminosity, temperature, color, name, spectral class, type, size, and age. It was created by two scientists, Hertzsprung and Russell.

Nuclear Fusion

Nuclear fusion is a process in which a star makes energy by changing two hydrogen gas molecules into one helium molecule. Nuclear fusion takes place in the center of a star. When the middle of a star becomes hot enough, nuclear reactions can start, and a new star is born. Without nuclear fusion a star won't be able to live. Nuclear fusion gives a star life and powers it up with energy.

The life Cycle of a Star

Although all stars are born with stellar nebula, a giant cloud of dust and gases, sun-like stars, huge stars, and giants stars have different life cycle. Sun-like stars are born with stellar nebula, after that they become red giants. Next, they collapse and explode into a cloud of dust and gases called planetary nebula. Then, they become white dwarfs. Lastly, they become black dwarfs, cold and dark objects. Just like sun-like stars, huge stars and giant stars are born with stellar nebula. Only then, they become red super giants and explode in a giant explosion called supernova. After that, huge stars become neutron stars, and giant stars die and turn into black holes, invisible objects that suck everything around it.