NAU

Lowell Observatory

If you look toward the eastern horizon just before dawn on a clear moonless night, you should see a ghostly white glow shining up through the dark sky.  This is zodiacal light, caused when passing comets and colliding asteroids shed space dust. That dust scatters sunlight upwards well before sunrise.


Melissa Sevigny

The Grand Canyon is running short on sand. Sediment that once washed down the Colorado River to form beaches is now trapped behind Glen Canyon Dam. For two decades river managers have released artificial floods to rebuild the beaches … but it’s not clear if the river has enough sand for these experiments to work in the long run. That’s what scientists want to find out.

Tom Brownold / www.tombrownold.com

It takes a very special kind of mule to carry visitors to Phantom Ranch at the bottom of the Grand Canyon. 


Brocken Imaglory

Southwest deserts are a good place to see atmospheric phenomena called mirages. They occur where distinct layers of warm and cooler air form. When hot air is trapped below cooler air, entering light is inverted and bent upwards – forming an inferior mirage below the real object.


President-elect Donald Trump has promised mass deportations upon taking office. Many universities, colleges and community colleges are responding by adopting Sanctuary Campus status, which pledges certain protections to undocumented students registered in the Deferred Action for Childhood Arrivals Program, or DACA. Next week, Northern Arizona University will decide whether it will become a Sanctuary Campus. KNAU’s Gillian Ferris spoke with Dr.

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