Observing the Cosmic Ladder: Airglow

This week we’re ascending the “cosmic ladder” once again, but this time we’ll focus on objects you can see at every step along the way without the need for any special equipment!

The first step on our journey is right outside: Earth’s atmosphere. Everything we see from the ground is viewed through the thin veil of atmosphere that encloses our planet, but sometimes the atmosphere itself is worth looking at. Most people know about the aurora displays, but there’s another lesser known effect called “airglow” that’s visible anywhere. 

Molecules of nitrogen and oxygen in the upper atmosphere absorb radiation from the Sun and release the excess energy as a faint glow of light across the sky. You can see this for yourself on even the darkest night away from city lights by gazing directly at the horizon. You’ll notice that the ground is dark and casts a silhouette against what appears to be empty, faintly blue sky.

Watch NASA’s video on this to learn more:

Join us Wednesday 8/26 @ 6:00 PM for a full program on the Cosmic Ladder! Email LBmartin@cityofwestminster.us to register for this free virtual program.

Check back each weekday @ 5:00 pm for more observing guides and science news!

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Stay well, and clear skies!