When a ring appears in the sky around the sun, it is called a halo. Halos have also been observed around the moon in the night sky.
A halo appears around the sun when thin cirrus clouds containing tiny ice crystals occur above about 20,000 feet. The sunlight is refracted by the ice crystals and produces a ring that appears 22 degrees from the sun. Most halos are bright white, but the dispersion of the light is also capable of causing a halo to have colors, sometimes with a red band toward the inside and a blue band toward the outside. Lunar halos are more likely to be white since moonlight is not as bright as sunlight. Halos appear most frequently in the winter, spring and autumn.Learn More
The Sun is classified as a G2 star with a luminosity class of V. This means it's a common dwarf star with a surface temperature of about 9,941 degrees Fahrenheit.Full Answer >
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 >
A solar flare is a sudden burst of energy erupting from the sun's corona. When the sun's magnetic field twists around sunspots, it can create a barrier that prevents energy from flowing outward. After enough energy builds up below the surface of the sun, it can burst out suddenly, sending a wave of energy out into the solar system.Full Answer >