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Published byChrystal Booth Modified over 8 years ago
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Astronomy II - SeeS Galaxies and Distant Objects
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Stars Large ball made up of burning Hydrogen Our Sun is a Star
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How do we know what a Star is Made of? Astronomers study spectral lines.
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Constellations A Constellation is a picture made of stars created from our imagination. Astronomer’s use Greek pictures to name locations of stars in the sky.
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Galaxy A Galaxy is made up of billions and billions of stars. The Galaxy we live in is called the Milky Way. There are billions and billions of Galaxies in the Universe.
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How do we know the distance to Stars? Astronomers use a process called Parallax to find the distance to our closest stars.
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Parallax The shift of an object against a background caused by a change in an observer’s position
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Parallax Since the Earth moves, we can see parallax with stars. July Earth Sun January Star A Star B Star C
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How do we know the distance to Galaxies? Astronomer’s use a process called Standard Candle Method. They compare two objects of the same brightness.
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Distance across Earth - 3, 959 Miles
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Distance to closest star - 4.24 light years
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Distance across Milky Way - 100,000 light years
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Distance from Earth to edge of Universe - 46 billion light years
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