NASA ICON

Astronomy in Space with David Dickinson

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.

Save Dark Skies

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.

Green-striped night

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.

Save Dark Skies

Rate Your Skyglow

Light pollution is most amateur astronomers' worst enemy. Learn here how to measure and describe how brightly your sky glows.

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