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
Why Does the Sun Shine? (The Sun Is a Mass of Incandescent Gas) Why Does the Sun Shine? (The Sun Is a Mass of Incandescent Gas) Why Does the Sun Shine? (The Sun Is a Mass of Incandescent Gas) is an EP by alternative rock band They Might Be Giants, released in 1993. The EP is notable for being their first release with a full-band lineup, rather than only the two original members (John Flansburgh and John Linnell) performing. It was also released as a single on 7" vinyl. All of the songs on the EP are cover versions, except for one. The title song is a cover of a song by Hy