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
The Sun Comes Out World Tour of the tour was scheduled to be held on 12 April, in Panama. The name of the tour was initially speculated to be "Tour of Earthly Delights", until Shakira's official website revealed the poster of the tour on 8 September, which highlighted "The Sun Comes Out World Tour" as the name. The poster of the tour features Shakira jumping in the air wearing a golden bikini top coupled with golden pants, similar to the cover art of her 2010 single "Loca". The tour was launched to promote Shakira's eighth studio album "She Wolf", which was released in October 2009, and