Since most of our planet is comprised of water - with the ocean making up over 70% of the Earth’s surface - there’s a lot to be discovered in the sea, and it’s a place that captivates at every turn.

For more than 500 million years – well before dinosaurs ever thought of existing – jellyfish have floated through the world’s oceans. Today, 2,000 species of jellyfish have been discovered around the ...

The oceans of the world are made up of countless fascinating creatures, many of which have yet to be discovered. It’s argued that among the most beautiful and majestic of the ocean creatures are the ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Some types of sea ...

Giant isopods scurry like roly-poly bugs in a touch tank. Japanese spider crabs the size of Labrador retrievers stalk a whale skeleton. Glasslike jellies crackle with electric-rainbow lights. Into the ...

SeaWorld San Diego’s newest attraction is an aquarium full of jellyfish species that has guests of all ages feeling like they’ve stepped into an underwater lava lamp with these otherworldly creatures.