Experts also learn abut distant stars and galaxies by analyzing the UV rays that are given off. Artificial sources of ultraviolet light are often used to stimulate the effects of solar ultraviolet radiation in the study of the deterioration of materials on exposure to sunlight . They are used to make black lights. May food and drug companies use germicidal lamps to disinfect various types of products, and their containers. Ultraviolet light is emitted by the sun.
Ultraviolet radiation is related with hot objects.
Examples are stars with surface temperature in range of 50,000 to 1000,000 K and hot gas clouds found between the stars. Overexposure to these ultraviolet waves can cause painful eye irritation, sunburns and skin cancer. These waves can also cause the destruction of plants and the breakdown of the ozone layer. Ultraviolet exposure can also damage and kill plants. Some photobiological effects include cell mutation, interference in the division of cells and an increased rate of respiration.