Time-lapse video taken from Croatia at around 4 p.m. EST, or 9 p.m. local time, shows the glowing light spinning across the sky in what many social media commentators likened to a spiral galaxy.

The annual celebration of our Independence Day will dazzle the skies but will come with more sizzling heat with air quality ...

Ever wondered why the sky is blue? It's not just a reflection of the ocean! Sunlight, seemingly white, is a mix of colors. As it enters Earth's atmosp ...

Blue light has a shorter wavelength, due to which it’s scattered more easily by the tiny molecules in the air. This scattering, known as Rayleigh scattering, is why we see a blue sky during the day.

Fireworks were first invented serendipitously by the Chinese in 200 B.C. but getting that perfect blue is a challenge ...

How to see the northern lights—and why they’re showing up more recently. The aurora borealis and aurora australis have dazzled us in the night sky for centuries.Here’s what causes them—and ...