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Bringing Light into Darkness

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      Ocean twilight zone scientists tackle the challenge of bringing light into darkness
      By Evan Lubofsky | May 15, 2019

      Oceanographers studying creatures in the ocean twilight zone are facing an optical dilemma. They need to observe the fish in order to study them, but at ocean depths of 200 meters and beyond, there’s very little natural light trickling down from the surface. This means that submersibles developed to image and track these animals need to be equipped with lights that can illuminate the animals—and do so without scaring them off.

      “If we want to get down there and see the animals in their natural habitats, we need to shine lights on them,” said Joel Llopiz, a biologist at Woods Hole Oceanographic Institution. “But we’re not sure yet how they’ll respond to different types of lights.”

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