International Ultraviolet Explorer was considered the most successful astronomical satellite ever. The human eye can perceive light with wavelengths between roughly 350 (violet) and 700 (red) nanometres. Ultraviolet light has wavelengths between roughly 10 nm and 350 nm. UV light can be harmful to human beings, and is strongly absorbed by the ozone layer. This makes it impossible to observe UV emission from astronomical objects from the ground. Many types of object emit copious quantities of UV radiation, though: the hottest and most massive stars in the universe can have surface temperatures high enough that the vast majority of their light is emitted
Harmful influence of technology different character than they are in the real life, what is not that easy to do in real communication or even the voice call. Harmful influence of technology Harmful influence of technology refers to the negative effect of technology which comes along with all of the useful implementations of variety of devices and innovations. People are constantly exposed to waves and radiation emitted from various appliances that are in everyday use. The rapid increase of the number of users of the mobile phones started in the last twenty years of the 20th century, and now multi-functionality of smartphones attract more