Calling all explorers for a Martian treasure hunt! No spacesuit required. We can help discover new alien landscapes from the comfort of our computer chairs. Ready, set, click! Mars or bust…

These spiders' bold faux faces and smile-like markings aren't there to make you laugh, instead they serve to scare and confuse potential predators.

Arachnophobia: the irrational fear of spiders. These hairy 8-legged, multi-eyeballed spiders may inspire fear, but get up close and they look almost cuddly.

These six spectacular sacred stones from the stars illustrate the influence these astronomical visitors have had on humanity down through history.

Nature is amazing with the emotions she can invoke, from excitement to relaxation. So kick back and relax with these 26 soothing water on the rocks photos.

Produced by one-way visits from distant space and time, these 10 meteor craters bear witness to violent events that greatly impacted our planet - literally!

Using 25 of a cat whisperer's extraordinary images, here are 10 large cats we might not normally get close enough to say, here kitty kitty, smile for the camera.

Size DOES matter: These 9 amazing animals prove that when the going gets tough, the tough get big!

The Hubble pierces the heart of outer space darkness, delighting us as our super eye in the sky. Here are 23 famous Hubble discoveries and NASA heavy hitters.

Gloriously hued and ephemeral in nature, these ten amazing rainbows show what happens when Mother Nature gets out her paintbox.

Solar and wind energy get a lot of time in the news, but what about all of the other fuel sources being considered? These are five of the more offbeat ideas.

Polar bears are the top predator in the arctic marine ecosystem. But thanks to mankind, these magnificent animals are headed for extinction.

This cool collection of striped, streaked and striated icebergs show that there's much to be gained by freezing between the lines.

A group of students in Utah learned that even small actions can have big environmental effects. Their class project will bring clean power to 44,000 homes.

Though most typically white, snow can take on a rainbow of different hues due to a wide spectrum of environmental additives.