Able to fit a Boeing 747 and a block of skyscrapers, the largest cave in the world hides in Vietnam. Here's what you need to ...

Rocket launches can create eerie patterns in the sky, from undulating bright-blue spirals to glowing “jellyfish” blobs. Here’s why they happen and how to spot them.

In the dense forests of Central and South America lives a bird so elusive it often goes unnoticed even in plain sight. Known for its eerie nighttime calls and uncanny stillness, the Potoo ...

It does, however, make for an eerie look to our sunsets and sunrises. You also see this whenever Saharan dust travels this far west and north. At sunrise and sunset, the sun's beams are passing ...