SUNSET: 
NASA Launches ICON to Explore Earth's Ionosphere
NASA's Ionospheric Connection Explorer (ICON) launched successfully today to explore the boundary between Earth and space.
Explore the Night with Bob King
How Dark Is Your Night Sky?
Traditional and digital tools can help you learn the naked-eye magnitude limit of your sky and find out if the darkness has changed at your observing site.
Astrophotography: Tips & Techniques
How to Remove Light Pollution from Your Astro Images
Find out how to remove light pollution from your astrophotos so you can have dark skies instead of red-brown ones.
Explore the Night with Bob King
Why We Can See In The Dark
In search of a pitch black night? Don't expect to find it on Earth. Thanks to starlight, zodiacal light, and especially airglow, true darkness doesn't exist.
Rate Your Skyglow
Light pollution is most amateur astronomers' worst enemy. Learn here how to measure and describe how brightly your sky glows.
