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Transcript
Star Notes Name:___________________ A Star is a ball of matter that is pulled together by ________________, and that gives of ________________ as a result of________________________________ (when two atoms bond together to make one heavier atom). 1. Composition of Stars: The 2 most abundant elements in stars are ______________and ______________. –Scientists determine the composition by studying the _________________that comes from a star. How Light shows composition: when elements in a star burn, they give off certain colors of light. The ____________of _____________ corresponds to a specific _____________________of the light. •Scientists look at the light from a star through a__________________________. A spectroscope breaks light apart and shows the wavelengths of the light. •Each ____________________gives off a unique pattern, or color__________________. If scientists find that pattern in a star’s light, they know that element is present in the star. –Example: When you burn sodium, it produces a yellow flame. •Astronomers match up the lines on the spectrum coming from a star with the dark lines different elements produce when they burn to determine the _____________________________ of the star. 2. Temperature: Scientists estimate the _________________of stars by the _______________of the star. 3. Magnitude: The Brightness of a star depends on three things: –__________________ –__________________ –__________________from us •_____________________Magnitude: How bright a star is when viewed from___________. A very large, hot star could look dim just because it is so far away. •_____________________Magnitude: the amount of ____________ that is actually given off by a star. 4. Measuring the Distance to Stars: we measure the distance between objects in space using ___________. –Parallax is the apparent change in _______________of a star in the sky when viewed from two different positions in earth’s revolution. The ______________a star is, the ________________its parallax, or apparent movement. The _____________away a star is, the _______________its parallax. •When we observe Star X from Location 1, it appears to be beside Star B. •When we observe Star X from Location 2, it appears to be beside Star A. Did Star X really move? ______ 5. Measuring Distance in Space •Light-Year- The _____________that light can travel in one__________. 5,865,696,000,000 miles •Astronomical Unit (AU)- the distance between the _________and the ___________(93 million miles) 6. ______________________are patterns of _________________in the sky. •________________Constellations: Constellations that appear to _____________around the North Star. •Major constellations: ____________________ and _____________________________ 7. Important Stars •_______________: The North Star: The star directly above the earth’s axis of rotation, or the north pole. It appears to stay in the same place all year, and other constellations revolve around it. •_________________________: Closest star to us (other than the__________)