4K HD Wallpaper: Space Station
The 1st 4K image from portfolio of Steve Bidmead and available free under CC0 license from his courtesy. Download if you like it and use in desktop backgrounds, homescreen phones, social media, content marketing, blogs...
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)