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Star and H-R voab

TermDefinition
Life Cycle of a Star Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. Smaller stars, however, will last for several billion years, because they b
Interstellar Medium A thinly spread area of gas and dust. Form stars.
Nebula When Interstellar medium begins to collect into big clouds.
Protostar a contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun. Inside Nebula.
Equilibrium a state in which opposing forces or influences are balanced.
Star An extremely hot ball of gas with hydrogen fusing into helium at its core.
Main Sequence Stars live most of their lives in this phase and have achieved nuclear fusion.
Red Giant a very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.
Planetary Nebula a ring-shaped nebula formed by an expanding shell of gas around an aging star
White dwarf a small very dense star that is typically the size of a planet. A white dwarf is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula
Black dwarfs a white dwarf that has cooled sufficiently that it no longer emits significant heat or light
red super giant Same as red giant but bigger.
Supernova a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
Neutron Star Core left behind after a supernova, and gravity is very high.
Black hole a region of space having a gravitational field so intense that no matter or radiation can escape
Created by: nginskey
 

 



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