UNIVERSE
SPACE EXPLORATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As the light source passes Earth, the wavelength increases as the frequency increases.
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As the light source moves toward Earth, the wavelength decreases as the frequency increases.
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As the light source moves away from Earth, the wavelength increases as the frequency decreases.
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As the light source affects the gravity of Earth, the wavelength decreases as the frequency decreases.
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Detailed explanation-1: -During his work studying galaxies, Hubble used Cepheid variable stars to measure the distances to a sample of galaxies.
Detailed explanation-2: -Hubble also demonstrated that galaxies farther away from us are receding faster than those nearby – a fundamental observation now known as Hubble’s Law. The idea of an expanding universe is a key underpinning of the Big Bang Theory. Hubble’s observations provided the earliest insight into the origins of our universe.
Detailed explanation-3: -Edwin Hubble used the Doppler Effect to determine that the universe expands. Hubble found out the light between the galaxies shift toward higher frequencies or the red end of the spectrum. This is known as a red Doppler shift, or the red-shift.