This week on Blue Planet II we explored the open ocean; home to some of the biggest and most spectacular creatures on earth. How much do you know about the big blue?

However, the ocean and its accompanying blue economy are actively being threatened ... As climate change raises ocean temperatures, action to protect the planet's oceans is becoming more necessary.

If Blue Planet II has inspired you to help our oceans ... Every year, around 8 million metric tons of plastic waste enters the ocean, where it can prove fatal to marine life.

A planet’s opposition occurs when Earth passes ... has spewing geysers, and may have an ocean. “If you do have a small telescope with an aperture of 3-inch or 4-inch then it’s not too ...

Surrounding tropical islands, coral reefs can extend for miles into the deep ocean ... blue undertones” that get darker along its back and lighter below the eye, researchers said. The area under ...