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 Earth orbits around the Sun at an astonishing 67,000 miles per hour. It takes the Earth 365 days to make a complete circle around the Sun.Full Answer >
Heat energy from the sun reaches the Earth through a heat transfer process known as radiation. Radiation involves the transfer of heat through infrared waves.Full Answer >
The red or orange tint the sun sometimes takes is caused by small particles in the Earth's atmosphere. The sun appears redder at sunset because the light must pass through a greater thickness of air compared to when the sun is at its zenith.Full Answer >
The sun gives off solar energy. The sun is a star that is a furnace in which hydrogen nuclei undergo fusion to produce helium along with rarer and heavier elements.Full Answer >