expansion of the universe

Expansion of the Universe 11/13-14/07 Ms. Shinkle

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introduction to redshift

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Expansion of the Universe

11/13-14/07Ms. Shinkle

Edwin Hubble’s Findings• Observed atomic spectra from

stars• Atomic spectra from stars shifted

from expected• More shift from galaxies further

away

Red Shift & Blue Shift•If source receding, waves

red-shifted•If source approaching,

waves blue-shifted

What Red-Shift Means•All galaxies moving away

from each other•More shift means greater

velocity•Distant galaxies moving

faster

Dark Matter & Other Mysteries•Evidence of more gravity

than matter that can be seen–Dark Matter

•Expansion of galaxies seems to be speeding up–Dark Energy

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