NASA astronaut Nichole Ayers photographed a rare atmospheric phenomenon over the US and Mexico known as a "sprite" that's ...

If you’ve ever stared up and thought, “Wow, the sky looks pretty brilliant today!” you can thank tiny critters called phytoplankton for that. A new study illustrates the important role these ...

It looks like a giant swath of milky haze in the sky, which is where it gets the name. We’re in the Milky Way Galaxy, on an outer arm, and what we see in the sky is our view toward the center of ...

The next mind-boggling shot of Toronto engulfed in clouds might be waiting for you. MORE PHOTOS Photos (in order) by tomms , via Reddit , Nock4Six , ryandt33 , tomms , ronnyg , via Dark Roasted ...

Dear Tom, In the fall and winter, the clouds over the lake appear like mountains in the distance. Why does this seem to only happen then? — Arlene McFadden Dear Arlene, What you are seeing are ...