The new moon occurs April 27, and a day later Venus and Saturn will make a close approach to each other (known as a ...

Harnessing fusion energy on Earth "will transform the planet," and University of Arizona researchers want the school to ...

On Sunday, April 27, the Moon will be about 221,900 miles from Earth when it reaches perigee, the closest distance in its ...

Shadows sharpened, daylight dimmed to dusk and a hush fell over millions of onlookers as the moon slid perfectly between Earth and the sun ... from around the world. Arizona was not in the ...

This Earth Day, people across Arizona are coming together to celebrate our planet and pledge new ways to protect it.

A geomagnetic storm unleashed by the sun on Sunday could create colorful auroral displays over parts of the United States ...