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Name the closest star to Earth. Stars The Spectrum Scientists break down the light from a star into colors using a spectrum The spectrum colors from the light show the star’s temperature and composition. The pattern of lines also show some of the elements in the star’s atmosphere. How do we classify stars? Temperature: **Hottest stars are BLUE or WHITE **Coolest stars are RED or ORANGE How do we classify stars? Brightness: The amount of light the star gives off Depends on size and temperature Large cooler bright Small hot bright Apparent Magnitude: How bright the star appears from Earth; closer = brighter Absolute Magnitude: How bright the star is actually shining – hard to determine Measuring Distance to Stars in light years – LY LY – the distance light travels in 1 yr. It is a measurement of distance not time. 300,000 km per second! Closest star is Proxima Centauri at 4.2 LY away. Traveling 300,000 km per second it would take 4.2 Earth years to get there! Measured