Critical+Vocabulary


 * Hertzsprung-Russell Diagram-** Diagram used to show the relationship bettween surface temperature and brightness between stars.
 * Magnitude-**the brightness of a star
 * Luminosity-**How much light an object can emit.
 * Nebula-**A large amount of gas and dust in space
 * Main Sequence**- An area of the H-R diagram that runs from the upper left to the lower right and includes more then 90% of stars.
 * Giant-** A very large star much larger than the sun
 * Super-Giant-** Larger than a giant star
 * Supernova-** An explosion of a dyieng giant or super giant star.
 * Dwarfs-** Small star
 * Galaxy-** a giant structure that contains dust, gas, and hundreds of billions of stars
 * Fusion-** the joining of hydrogen and helium molecules
 * Black-hole-** the remains of an extremely massive star pulled into smal volume by te force of gravtiy
 * Neutron Star**- A star that is even smaller and denser then white dwarfs
 * Protostar-**The first phase of the star
 * Scientific Theory-** a well tested concept that explains a wide range of observations.
 * Big Bang theory-** the universe started with an explosion 10 to 15 billion years ago.
 * Light years-** the distance traveled by light in one year.
 * light seconds-** the distance light travels in one second
 * Apparent Magnitude-** How bright the star seems from earth
 * Absolute magnitude**- How bright a star would be if it was a standard distnace away from Earth