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Large radio telescopes, similar in appearance to large satellite dishes, to detect radio waves from space.

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Large radio telescopes, similar in appearance to large satellite dishes, to detect radio waves from space.

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It travels at a constant rate of about 300,000 kilometers per second. We call this the speed of light.

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It travels at a constant rate of about 300,000 kilometers per second. We call this the speed of light.

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This energy is the fastest thing in the universe.

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This energy is the fastest thing in the universe.

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Energy that travels at high speeds through space in wavelike patterns.

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Energy that travels at high speeds through space in wavelike patterns.

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Scientists can use this to calculate the rate of the expansion of the universe and to work backward to determine when the expansion began.

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Scientists can use this to calculate the rate of the expansion of the universe and to work backward to determine when the expansion began.

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It occurs as objects move farther away from a source and the light shifts toward the red end of the electromagnetic spectrum.

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It occurs as objects move farther away from a source and the light shifts toward the red end of the electromagnetic spectrum.

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Scientists can estimate the age of the universe by observing the universe’s oldest stars and the intensity of this phenomenon.

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Scientists can estimate the age of the universe by observing the universe’s oldest stars and the intensity of this phenomenon.

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The universe continues to expand to this day.

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The universe continues to expand to this day.

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Says that the universe expanded rapidly at first.

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Says that the universe expanded rapidly at first.

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Says that the universe began as a very dense, hot, single point in space.

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Says that the universe began as a very dense, hot, single point in space.

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Most widely accepted theory to explain the origin of the universe.

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Most widely accepted theory to explain the origin of the universe.

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Essential instruments for studying far reaches of the universe.

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Essential instruments for studying far reaches of the universe.