This space wallpaper showcases the ancient globular cluster 47 Tucanae, a dense swarm of up to a million stars. The image at left shows the entire cluster, which measures about 120 light-years across.

Being able to download wallpaper theme packs is a fun ... Last I checked, Microsoft is not operating a deep-space telescope, and such images in 4K are rarely free. Of course, if you want free ...