For the Element of Harmony, see the appropriate section of the Elements of Harmony article. My Little Pony Friendship is Magic possesses many fantasy elements. A prominent one is the use of magic by ponies and other creatures such as changelings. Throughout the show, Earth ponies tend to crops and care for plants and animals, particularly in Winter Wrap Up, Fall Weather Friends, and Hearth's Warming Eve.
Visible light is merely a small part of the full electromagnetic spectrum, which extends from cosmic rays at the highest energies down through the middle range (gamma rays, X- rays, the ultraviolet, the visible, the infrared, and radio waves) all the way to induction-heating and electric-power-transmission frequencies at the lowest energies.
Visible light is a small fraction of the entire electromagnetic spectrum with wavelengths ranging from 380 nm (nanometres or 10-9 m) to 740 nm. The whole bandwidth of the spectrum is illustrated in the following image. All the different types of electromagnetic radiation consist of photons of a specific wavelength. All objects that are warmer than their surrounding (that includes all the astronomical objects like stars, nebulae, planets, etc.) emit photons within a certain range of different wavelengths.