In addition, on dark nights the sky glow (known as nitrogen fluorescence) generated by the passage of these particles can be imaged with telescopes located on the boundary of the array. (auger.org)
There are millions of urbanites who have never seen the wonders of a truly dark night sky. (planetary.org)
Detour past the world's largest tower, Burj Khalifra, to see its 163 floors illuminated against the backdrop of Dubai's inky dark night sky. (qatar-travelguide.com)