Sometimes, a hole in the ground is just a hole. Other times, it’s a portal to an underground cave spanning miles in width and length. You don’t really know what’s inside unless you dive into the void.

Add Yahoo as a preferred source to see more of our stories on Google. A visualization of the glass lava lake spotted on Jupiter's volcanic moon Io. A new animation reveals an enormous lava lake on the ...

At first glance, this piece looked more like cooled lava than wood. The texture, color, and surface were so unusual that I wasn’t even sure how it would cut once it hit the lathe. As the turning began ...

Weird lava worlds can shed light on our planet’s past, suggests a recent study. When you think about a habitable planet, you probably don’t picture a fiery ocean of magma churning on the surface of an ...