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

A newly found, huge cloud near our solar system probably won't form stars, but will rather disperse as part of a feedback ...

(Why is the sky blue? Learn about it with your kids.) The aurora borealis lights up the night sky behind Iceland's iconic Kirkjufell volcano. Auroras are caused when charged particles from the sun ...