Stars

Each star in the sky is an enormous gleaming b every(prenominal) of float. Our sun is a medium-sized star.

Stars can live for billions of years. A star is born when an enormous cloud of hydrogen gas collapses until it is hot enough to burn nuclear fuel (producing big amounts heat and radiation). As the nuclear fuel runs out (in approximately 5 billion years), the star expands and the core contracts, becoming a heavyweight star which eventually explodes and turns into a dim, cool mark (a black dwarf, neutron star, or black hole, depending on its initial mass). The largest stars ask the shortest life span (still billions of years); more massive stars burn hotter and red-hot than their smaller counterparts (like the Sun).
The composition of stars is studied using spectroscopy in which their visible light (the spectrum) is studied.

GROUPS OF STARS
In the universe, most stars occur in groups of at least two stars. Two stars that be locked in elliptical orbit around their center of mass (their barycenter) are called a binary star system. About half of all stars are in a binary star system.


globular CLUSTER
A globular star cluster is a orbicular group of up to a million stars held together by gravity. These remote objects lie mostly around the central break through of spiral galaxies.There are larger groups of stars, called clusters.



These are relatively uncoordinated collections of stars. An open cluster is a loose collection of up to about 1,000 stars. Examples of open clusters include the Pleiades and Hyades.

Huge, organized collections of stars are called galaxies. Our solar system is located in the Milky Way Galaxy, a spiral galaxy. For more in-depth information on galaxies, click here.

all in all groups of stars are held together by gravitational forces.

WHY argon STARS HOT AND BRIGHT?
Nuclear Fusion and Nucleosynthesis
Stars are giant nuclear reactors. In the center of stars, atoms are taken away by tremendous atomic collisions that alter the atomic building and release...If you want to get a full essay, order it on our website: Ordercustompaper.com



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