Chat With Me
Whatch me live on Chaturbate.
Star
A star is a luminous gas ball held together by gravity. It is mainly composed of hydrogen and helium with traces from other elements. The stars are the building blocks for galaxies, and they play a vital role in the structure and evolution of the universe.
Stars are formed by giant molecular cloud, which are dense regions in space of gas and dust. Star formation begins when these molecular clouds collapse under their own gravitation. As the cloud shrinks, it begins to spin and form a rotating disk. In the middle of this rotating disk, a protostar is formed, which is a dense gas and dust core.
As the protostar continues accumulating mass, it becomes denser and hotter. Eventually, its core temperature and pressure will be high enough to trigger nuclear fusion. This is the process whereby hydrogen atoms combine into helium. This fusion reaction releases a huge amount of energy that makes the star glow brightly.
The mass of a star determines its life cycle. Low-mass star, such as our Sun, follows a relatively peaceful, stable path. They spend the majority of their lives fusing helium into hydrogen in their cores to maintain a stable temperature and size. As they exhaust their nuclear energy, they begin to expand, becoming red giants. They eventually shed their outer layers to form a planetary-nebula and the core remains as a white dwarf.
The fate of high-mass stars is more dramatic. They are able to burn through their nuclear energy much faster and have a shorter life expectancy. These stars can become hotter and more brilliant than low-mass ones, and their core temperature is high enough to ignite heavier materials. High-mass stars experience a series explosive events as they exhaust their nuclear energy, such as supernovae or gamma ray bursts. These events release a huge amount of energy, and can be seen from a great distance.
After a star of high mass explodes into a supernova it leaves either a blackhole or a neutron-star behind. Neutron stars contain a mass 1.4 times greater than the Sun, but only have a diameter of 20 kilometers. Black holes have such strong gravitational force that nothing can escape them, not even the light.
Stars are often found in groups or clusters. Galaxies are made up of billions or trillions stars that are held together by gravity. About 200 billion stars are found in the Milky Way galaxy, our home galaxy. These stars are arranged into different structures, including spiral arms, open clusters, globular groups, and globular clusters.
Since ancient times, stars have fascinated people. They have been used as navigational aids and their patterns to create constellations. They have also been the focus of countless myths and legends as well as religious beliefs. Scientists continue to study stars today to understand the fundamental processes which shape the universe, and to search for signs extraterrestrial.
Stars are the basic building blocks of the Universe. They are formed from giant molecular cloud, undergo fusion reactions that release energy, and have a vital role in the evolution galaxies. Stars of low or high mass have different life cycles which affect their surroundings. Their beauty and power continue to inspire and captivate us, and drive our quest to uncover the mysteries of the universe.