The Origin and Journey of Solar Radiation Deep within the sun, nuclear fusion reactions convert hydrogen into helium, releasing an immense amount of energy in the form of gamma rays. High-energy ultraviolet (UV) radiation, for instance, is largely absorbed by ozone in the stratosphere, protecting life on the surface from its harmful effects.
How Sunlight Travels Through Space: From the Sun's Core to Earth
This process, known as radiative transfer, requires no physical substance and is highly efficient over cosmic distances. On a cloudy day, nearly all the solar energy arriving at the surface is diffuse, whereas a clear day features a higher proportion of direct radiation.
This increase in molecular motion is what we measure as a rise in temperature. This energy does not travel directly to Earth as a concentrated beam; instead, it undergoes a random walk, being absorbed and re-emitted by progressively cooler layers of plasma over tens of thousands of years.
How Sunlight Travels Through Space and Transfers Energy
Absorption occurs when the material’s atoms absorb the photon’s energy, causing molecules to vibrate more rapidly. Shorter blue wavelengths are scattered by molecules of gas and tiny particles in a phenomenon known as Rayleigh scattering, which is why the sky appears blue.
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