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Emperor shrimp, and two nudibranches at Dinah’s Beach, Papua New Guinea.
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Nudibranch With a Shrimp Partner

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Model of a lion’s mane jellyfish on display at the Smithsonian National Museum of Natural History. This jellyfish, a member of the phylum Cnidaria, can have tentacles up to 190 feet long (58 meters) and a bell almost 7 feet (2 meters) in diameter.
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Lion's Mane Jellyfish in Sant Ocean Hall

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Scientists use satellite images of the ocean to estimate chlorophyll concentrations in the water. You can see the yellow swirls of phytoplankton concentrated at the sea surface in this image.
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Satellite Image of Chlorophyll Concentration

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Encrusted pumice
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Encrusted Pumice

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Building a Better Dispersant: When we wash dishes at home, we use dish soap to break up and wash away any oil that is stuck to our plates and utensils. Similarly, stronger soap-like chemicals called dispersants can be used to break up oil spills, like thos
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Building a Better Dispersant

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Three types of squid tentacles and their suckers
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A Squid's Suckers

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A photograph of a bright blue-speckeled dinoflagellate bioluminescing at night.
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Bioluminescing Dinoflagellate

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These deep-sea corals at the Madison-Swanson Marine Reserve are protected, along with the marine life they harbor.
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Protected Deep-sea Corals

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Broad-leaf seagrass (Posidonia australis) with algae epiphytes grows at Corner Inlet Marine National Park in Australia.
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Seagrass with Epiphytes

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Farther north, in Fort Pierce, Florida, researchers at the Smithsonian Marine Station focus on mangroves and other marine ecosystems of Florida.
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Smithsonian Marine Station

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The robotic arm of the ROV Quest finds life at an undersea vent.
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Studying Hydrothermal Vent Life

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A brilliant red octopus photographed at more than 8,800 feet (about 2,700 meters) in the Gulf of Mexico.
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Deep Water Octopus in the Gulf of Mexico

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