Edwin Hubble, in 1923, discovered the Andromeda Galaxy. He thought he was looking at a gas cloud, but in the photographs, he saw faint stars. He then concluded the universe is full of galaxies. He discovered almost all galaxies are moving from each other. Hubble discovered the galaxies are moving away from each other by analyzing radiation emitted by galaxies. The farther away a galaxy, the faster it is moving. White light includes all colors of light. This blend of light is called a spectrum. When the light passes through a prism, it separates the colors into different wavelength/color bands. It separates colors from the lowest frequency (red) to the highest frequency (violet). Each element creates its own pattern of dark lines, similar to an individual's fingerprints. Hydrogen looks different than helium. Astronomers use the lines to determine the elements in a star.
Lesson 4: Theories about the Universe
Word Bank-you may use a word more than once.
Element
same
sun
Geocentric
Andromeda
telescope
math
gravity
out
radiation
older
single
Heliocentric
Edwin Hubble, in 1923, discovered the blank Galaxy. He thought he was looking at a gas cloud, but in the photographs he saw faint stars. He then concluded the blank is full of galaxies. He discovered almost all galaxies are moving from each other. Hubble discovered the galaxies are moving away from each other by analyzing blank the emitted by galaxies. The farther away a galaxy, the faster it is moving. White light includes all colors of light. This blend of light is called a blank When the light passes through a prism it separates the colors into different wavelength/color bands. It separates colors from lowest frequency (red) to highest frequency (violet). Each blank creates its own pattern of dark lines, similar to an individual's Fingerprints. Hydrogen looks different than helium. Astronomers use the lines to determine the elements in a star.
1 answer
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