What is red-shift?
Red-shift is the concept that the wavelengths of light from distant galaxies are higher than expected. The further away the galaxy, the more significant the increase in wavelength.
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What causes the red-shift of light?
Red-shift occurs because the light emitted by an object moving away from us will be stretched. The stretching causes the light's wavelength to increase.
The faster an object moves away from us, the larger the red-shift will be.
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How does red-shift provide evidence for the big bang theory?
Red-shift shows that the universe is expanding, which supports the big-bang theory.
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Are galaxies moving away from each other through space, or is space itself stretching?
Space and the universe itself is expanding and this makes galaxies further apart.
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What is the formula linking red shift (z), recessional velocity (v), and the the speed of light (c)?
z = amount of red shift
v = recessional velocity (ms-1)
c = speed of light (ms-1)
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What is the formula linking change in wavelength (Δλ), wavelength (λ), recessional velocity (v), and speed of light (c)?
Δλ = difference between emitted and observed wavelength (m)
λ = emitted wavelength (m)
v = recessional velocity (m s-1)
c = speed of light (m s-1)
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