The+Stars+-+By+Bec

===__​T h e S t a r s __ ===  A star is a massive ball of Plasma that is held together by gravity. The closest star to Earth is the Sun, the sun is the source of most of Earth's energy. You can only see other stars in the night sky because during the day they are outshone by the Sun. Astronomers are able to determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and its motion through space. For most of its life, a star shines due to thermonuclear fusion in its core releasing energy that traverses the star's interior and then radiates into outer space. Almost all elements hevier than hydrogen and helium were created by fusion processes in stars. Binary and multi-star systems consist of two or more stars that are gravitationally bound, and generally move around each other in stable orbits. When two such stars have a relatively close orbit, their gravitational interaction can have a significant impact on their evolution. Stars can form part of a much larger gravitationally bound structure, such as a cluster or a galaxy.
 * By Bec **



=Constellations= There are 88 official constellations defined by the International Astronomical Union, they are mostly based upon those of the ancient Greek tradition, passed down through the Middle Ages, which includes the 12 constellations 'signs of the zodiac'.