The explanation for the differences in wavelength observed from earth and a distant star with a shift towards the red end of the spectrum is the Redshift- Doppler effect.
<h3>What is the Doppler effect?</h3>
The Doppler effect is the difference that occur between the frequency of a wave in relation to observer from the wave source.
The wavelength changes with change in the frequency.
<h3>How does the Doppler effect explain the redshift?</h3>
As an object moves away from Earth, the waves moves to the red end of the electromagnetic spectrum and becomes elongated. This results to the increase in wavelength.
Therefore, the explanation for the differences in wavelength observed from earth and a distant star with a shift towards the red end of the spectrum is the redshift-Doppler effect.
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Saturn is predominately composed of hydrogen and helium, yet doesn't undergo fusion like the Sun due to the lacking mass.
The balance of forces between internal pressures under continents and those under ocean basins is called the isostasy.
<h3>What is an isostasy?</h3>
It should be noted that an isostasy is the state of gravitational equilibrium that's between the Earth crust and the mantle.
According to the isostasy theory, a mass above sea level is supported by a mass below sea level, and as a result, the depth of compensation is the depth at which the Earth's total weight per unit area is equal everywhere around.
In this case, isostasy is the balance of forces between internal pressures under continents and those under ocean basins.
Therefore, based on the information, the answer is isostasy.
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