Sunlight is a kind of electromagnetic radiation emitted by the sun, namely infrared, visible, and ultraviolet light. Sunlight travels 8.3 minutes from the Sun's surface to Earth. At night, when the Sun is not visible, our planet turns dark but not completely so: There are still photons of infrared and visible wavelengths bouncing around out there. The next morning, when the Sun rises, it emits all these photons again.
The wavelength range of visible light is roughly 390 nanometers (nm) to 760 nm. The shortest wavelength of visible light is about 390 nm, and the longest is 790 nm. Solar radiation with wavelengths longer than 790 nm is called ultraviolet (UV). Radiation with wavelengths between 0 and 397 nm is called invisible radiation. Radiation with wavelengths between 400 and 799 nm is called infrared (IR). Sunlight is actually made up of a mixture of waves with different lengths. This means that some parts of the spectrum will affect organisms in ways different from others. For example, shorter wavelengths can be absorbed by molecules containing oxygen, while longer wavelengths can pass right through them. Plants use this property to absorb harmful UV rays while letting most of the light get through for photosynthesis to occur.
When sunlight hits water, it produces heat. The amount of heat depends on the intensity of the light and the depth of the water.
The sun moves at the speed of light. Photons released from the Sun's surface must traverse the vacuum of space to reach our sight. The quick answer is that sunlight travels from the sun to the earth in an average of 8 minutes and 20 seconds. The slow answer is that it takes light waves about 8 minutes 20 seconds to reach the earth.
Actually, light waves take longer than 8 minutes 20 seconds to reach the earth. The reason why you only see things on the earth after about 8 minutes 20 seconds is because that's when they were created. Before then, there was no signal to show that anything happened up there!
You might wonder, if the sun is so far away, how can it cause any effect on earth? The simple answer is that it doesn't! The earth causes effects all over space, even though we don't always notice them because events that happen very far away from each other can seem unconnected. For example: trees grow tall near roadways because cars passing by shake the ground with their wheels. This movement of air creates conditions under which trees can grow.
When stars shine their light onto the earth, they're actually shining into space. Only when this light reaches an object with water molecules does it become refracted or bent toward the eye that sees it. At that moment, it becomes possible for us to see these stars.
Sunlight is the electromagnetic energy released by the sun that reaches the earth, namely infrared, visible, and ultraviolet light. Radiation is made up of electromagnetic waves that may be distinguished by the frequency or wavelength of their oscillations. However, not all of it makes it to the Earth. Some of it is absorbed by molecules in the atmosphere (especially oxygen) while some is reflected back out into space.
Infrared radiation is energy that is vibrating water molecules, organic compounds, and other substances in which electrons are known to move around energetically. This movement can only occur because these molecules contain atoms with nuclei, which attract positive particles called protons. The protons in turn make the molecule polarize which allows energy to flow through it.
Visible light is electromagnetic radiation that we can see with our eyes. It is made up of photons with wavelengths between 400 nm and 700 nm. These wavelengths are too long for the human eye to detect separately, so the brain combines them into the color red, green, blue, or gray. Light from the sun includes both visible and invisible wavelengths, but plants use only the visible part. Animals have photoreceptors that respond to different parts of the spectrum - red for danger, green for food, and blue for the sky. Humans also benefit from sunlight because it contains vital nutrients such as vitamin D, krypton, and calcium.