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Stars Messages from the Stars Stars Vary in size, color, and temperature Color can indicate the size, temperature, and life span of the star. Pass through stages (Depends on its mass) Consist mainly of helium and hydrogen Messages from the Stars Why do stars shine? They’re burning and nuclear reactions are taking place in the core. Products given off by the reaction. Heat Light Radiowaves Radiation Messages from the Stars Life on a smaller star Begin as a nebulae (giant cloud of gas and dust) Turns into a star Gravity squeezes the clumps of gas and dust together with so much friction/pressure that it caused them to begin to glow and get hot. Sizes can vary Red Dwarf White Dwarf Small white star formed after all the surface gas is gone. Messages from the Stars Life of a larger star Begins as a nebulae Turns into a star Turns into a red super giant Turns into a supernova (death of a star) Visible for 1-2 years Turns into either a neutron star or a black hole. After all helium is gone, stars either blow up, shrink, or go cold. Sizes of Stars Red Super Giant Diameter = approximately 973 million km Red Giant Diameter = approximately 64 million km Colors of Stars The color of the star is related to the temperature at the surface. The coolest stars have a reddish color and the surface temperature of about 3000° C The hottest stars have a bluish color and a surface temperature of over 40,000° C Mapping the Night Sky Star Charts Ways of tracking where the constellations are located during the different seasons of the year. Remember as the earth revolves around the sun, it also rotates causing the stars to “shift” in the night sky. In actuality the stars are in the same place, it is just the earth that has rotated.