The radiative zone is the part of the sun?s interior that is between the inner core and the outer convective zone. In this zone, energy is efficiently transferred by photons to the surrounding region. The electromagnetic radiation of the radiative zone is the result of the energy of nuclear fusion at the core.
The radiative zone accounts for 45 percent of the sun?s radius. The core energy is carried outside as photons, which travel one micron before being absorbed by gas molecules. After the absorption of photons, the gas molecules heat up and emit additional photons of the same wavelength. The re-emitted photons move another micron and are absorbed by more gas molecules, and the cycle repeats. Nearly, 10^25 absorptions and re-emissions are estimated to occur before a photon to reaches the surface.
The part of the sun at the core and the radiative zone spin differently than the outer convective zone. The boundary between these two zones is called the tacholine. Stars that are cooler and smaller than the sun do not have radiative zones; instead, they have convective zones that extend to their cores. In larger stars, radiative zones appear to be larger, and convective zones appear to be smaller.Learn More
It takes the Earth approximately 365.25 days to complete one revolution around the sun. The extra quarter of a day that is gained each year is why a leap year is added to the calendar every four years. The day added in a leap year is February 29.Full Answer >
Sunlight is the result of electromagnetic radiation being emitted from the sun. Ultraviolet, visible and infrared light are the result of this radiation, and they have a profound effect on the Earth.Full Answer >
Sunset is the exact time the upper disk of the sun is at the horizon, whereas dusk is when the center of the sun is 18 degrees below the horizon, according to the National Institute of Standards and Technology. The hazy twilight in between sunset and dusk is caused by the scattering of sunlight in the upper atmosphere that gives the horizon a light blue appearance.Full Answer >
In elemental terms, the sun is made up of 74 percent hydrogen, 24 percent helium and 1 percent oxygen. The last 1 percent comprises of everything else, which includes carbon, nitrogen, silicon, magnesium, neon, iron and sulfur.Full Answer >