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

From Lowell Observatory to Kitt Peak to Mount Graham, here are the 11 best planetariums and observatories in Arizona and ...

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

Thirty-five years ago, the Hubble Space Telescope was launched into orbit. It's been sending back galactic data and images ...

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

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