star - What is an enormous, luminous sphere of hot gases (mainly hydrogen and helium) that continuously gives off light?, star size - _______ is typically measured in comparison to the size of the Sun., A star's size and distance from the earth - _______________can cause some stars to appear larger and/or brighter than other stars., luminosity - ____________is the total amount of energy (or light) emitted by a star., light-years - ___________ are how we measure a star’s distance from Earth, Sun - What is the closest star to the earth? It is a medium-sized star.,

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