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ch 22 2nd hour

for school

QuestionAnswer
fusion Creation of energy by joining the nuclei of two hydrogen atoms to form helium.
convection Heat transfer in a gas or liquid by the circulation of currents from one region to another
corona The outer layer of the sun's atmosphere.
sunspot a cooler darker spot appearing periodically on the sun's photosphere
solar wind A stream of electrically charged particles produced by the sun's corona
light-year The distance light travels in one year
parallax An apparent shift in the position of an object when viewed from different locations
nebula a large cloud of dust and gas that can break apart into smaller pieces and form stars
main sequence the stage in which stars produce energy through the fusion of hydrogen into helium
neutron star may occur when a supergiant collapses to a very dense core
black hole An object whose gravity is so strong that nothing, not even light, can escape.
quasar a quasi-stellar object
Doppler Effect An observed change in the frequency of a wave when the source or observer is moving
big bang The initial explosion that resulted in the formation and expansion of the universe
Created by: jake_weinrich