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
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 >
Once the sun touches the horizon, it takes approximately 2 to 3 minutes to go below the horizon. This is dependent on several factors, including latitude, time of year and atmospheric thickness.Full Answer >
The core of the sun reaches temperatures of about 27 million degrees Fahrenheit. However, different layers of the sun have different temperatures. The upper layer of the interior of the sun is less than 3.5 million degrees.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 >