In 1978, Penzias and Wilson won the Nobel Prize for their discovery of the cosmic microwave background (CMB) radiation. a) Explain what the CMB is and describe its main observed features. b) Knowing that its peak emission is at 1mm wavelength, estimate the temperature of the CMB. c) Estimate the average energy due to CMB radiation hitting the extended palm of your hand every second. d) Compare the result above with the energy per second that hits the same area due to the Sun.Consider that the effective temperature of the Sun is approximately 5780K, its radius 6.7x10 km,and its distance from Earth 1.5 × 108km.

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