The twentieth anniversary release of the Band Aid classic Do they know it's Christmas? is available for download from today.
On Thursday night an estimated 13.5 million people watched the video of the single, which was broadcast simultaneously on terrestrial and satellite television.
The track has been produced to raise money for victims of the famine and civil war in Sudan.
Industry analysts are closely watching the level of interest in the downloadable track, since the physical version will not be sold in the shops for another week.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007