As the spacecraft Cassini flew past Saturn's icy moon Enceladus, the orbiter detected molecular hydrogen, a finding announced Thursday. It's a nifty discovery, hinting that heated vents beneath Enceladus's oceans may have the right conditions for life. We didn't find any actual evidence of extraterrestrial organisms, though, despite NASA's cryptic news conference tease.
But! We don't have to travel far for an example of stumbling upon strange and unexpected creatures in a deep sea: only back to the 1970s, when humans met a cluster of giant tubeworms. These worms, according to the science of the time, had no business wriggling their red tentacles 8,000 feet under the ocean surface.
He was no biologist. The oceanographer phoned up to the surface, where Kathy Crane, then a graduate student at the Scripps Institution of Oceanography, was controlling the sub from the catamaran Lulu.
The researchers anticipated sterile lava fields. Instead they found not only the 4-foot-long worms, but a host of clams, crabs and an octopus. The non-biologists, for want of formaldehyde, preserved a few bizarre specimens in potent Russian vodka they'd bought in Panama. (The Smithsonian still has one of the worms collected from the 1977 expedition.)
The explorers aboard Alvin were nearly a mile below the ocean's midnight zone - the point at which sunlight no longer penetrates water and photosynthesis is impossible. A process called chemosynthesis was the key to life in this Stygian seascape.
Plants and other photosynthetic organisms rely on solar energy to fuel a reaction between carbon dioxide and water, yielding sugar and oxygen. Chemosynthesis works in a similar manner, substituting chemical nutrients for light. In the inky depths of the sea, bacteria soak up particles spewed by hydrothermal vents. Near the Pacific "black smokers" found in the 1970s, which belch up thick plumes, microbes can turn compounds such as hydrogen sulfide into sulfur. The microbes channel the energy released in this chemical reaction to create sugars. In the Atlantic, other bacteria live off methane vents, forming strange yarnlike strands.
The ecosystems are "natural wonders of the world," said Cindy Lee Van Dover, a deep-sea biologist at Duke University in North Carolina. "We think of them as living libraries, living laboratories."
Swimming along vents today are snails and shrimp swarms, which feast on bacteria. Tubeworms grow in clumps that biologists liken to gardens. The worms Corliss spotted have no digestive guts, instead using their flowerlike tentacles to sweep sulfur compounds inside their bodies. The chemicals end up in the worms' trophosomes, an organ filled with billions and billions of bacterial cells. These chemosynthetic bacteria use up the sulfur, producing nutrients that feed the worms.
(Available oxygen is a crucial difference between our deep sea and the one on Saturn's moon. "Enceladus probably doesn't have oxygen, so animals - at least as we know them here on Earth - couldn't live there," Dubilier said. "But many microorganisms can live without oxygen, so they might be able to live on Enceladus.")
Hydrothermal vents continue to spill new secrets. In June 2016, almost four decades after the scientists aboard Alvin saw the first vents, University of Rhode Island scientists discovered the first bioluminescent organism near a black smoker. Widder, an expert in bioluminescence, says the trick to spotting such animals is to get deep-sea vessels to turn off their lights - which can be a hard sell near vents that eject nearly 700-degree water.
Mining companies have also set their sights on the metal-rich areas around the hydrothermal vents. No corporation yet has permission to mine in international waters, Van Dover said. But Nautilus Minerals, a Canadian mining company, has embarked on a project called Solwara 1 to extract copper and gold off Papua New Guinea, a mile below the surface.
"I don't advocate one way or another about mining," Van Dover said. Rather, her research involves weighing options - "why we would mine," she said, "and why we wouldn't."
Humans need resources that the deep sea could provide. Van Dover pointed out that, like many people, she owns a cellphone, which requires rare metals to function. Deep-sea mining, though, raises several environmental questions. "What are you going to do with the wastewater?" she said. Van Dover described vent ecosystems as "robust," but deep-sea conservationists do not yet know what the cumulative impact of mining might be on these habitats.
One fear is that the ocean will lose something humans never knew existed. The worms that lack digestive tracts are something of a biological marvel, among the seafloor's oddest animals. Was it just luck, Van Dover wondered, that these creatures happened to live near the first hydrothermal vents humans ever encountered?
Put another way: Is there something out there, skittering beneath a cloud of black smoke, that's stranger still?
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
But! We don't have to travel far for an example of stumbling upon strange and unexpected creatures in a deep sea: only back to the 1970s, when humans met a cluster of giant tubeworms. These worms, according to the science of the time, had no business wriggling their red tentacles 8,000 feet under the ocean surface.
He was no biologist. The oceanographer phoned up to the surface, where Kathy Crane, then a graduate student at the Scripps Institution of Oceanography, was controlling the sub from the catamaran Lulu.
Advertisement
The researchers anticipated sterile lava fields. Instead they found not only the 4-foot-long worms, but a host of clams, crabs and an octopus. The non-biologists, for want of formaldehyde, preserved a few bizarre specimens in potent Russian vodka they'd bought in Panama. (The Smithsonian still has one of the worms collected from the 1977 expedition.)
Advertisement
The explorers aboard Alvin were nearly a mile below the ocean's midnight zone - the point at which sunlight no longer penetrates water and photosynthesis is impossible. A process called chemosynthesis was the key to life in this Stygian seascape.
Advertisement
Plants and other photosynthetic organisms rely on solar energy to fuel a reaction between carbon dioxide and water, yielding sugar and oxygen. Chemosynthesis works in a similar manner, substituting chemical nutrients for light. In the inky depths of the sea, bacteria soak up particles spewed by hydrothermal vents. Near the Pacific "black smokers" found in the 1970s, which belch up thick plumes, microbes can turn compounds such as hydrogen sulfide into sulfur. The microbes channel the energy released in this chemical reaction to create sugars. In the Atlantic, other bacteria live off methane vents, forming strange yarnlike strands.
Advertisement
The ecosystems are "natural wonders of the world," said Cindy Lee Van Dover, a deep-sea biologist at Duke University in North Carolina. "We think of them as living libraries, living laboratories."
Advertisement
Swimming along vents today are snails and shrimp swarms, which feast on bacteria. Tubeworms grow in clumps that biologists liken to gardens. The worms Corliss spotted have no digestive guts, instead using their flowerlike tentacles to sweep sulfur compounds inside their bodies. The chemicals end up in the worms' trophosomes, an organ filled with billions and billions of bacterial cells. These chemosynthetic bacteria use up the sulfur, producing nutrients that feed the worms.
(Available oxygen is a crucial difference between our deep sea and the one on Saturn's moon. "Enceladus probably doesn't have oxygen, so animals - at least as we know them here on Earth - couldn't live there," Dubilier said. "But many microorganisms can live without oxygen, so they might be able to live on Enceladus.")
Hydrothermal vents continue to spill new secrets. In June 2016, almost four decades after the scientists aboard Alvin saw the first vents, University of Rhode Island scientists discovered the first bioluminescent organism near a black smoker. Widder, an expert in bioluminescence, says the trick to spotting such animals is to get deep-sea vessels to turn off their lights - which can be a hard sell near vents that eject nearly 700-degree water.
Mining companies have also set their sights on the metal-rich areas around the hydrothermal vents. No corporation yet has permission to mine in international waters, Van Dover said. But Nautilus Minerals, a Canadian mining company, has embarked on a project called Solwara 1 to extract copper and gold off Papua New Guinea, a mile below the surface.
"I don't advocate one way or another about mining," Van Dover said. Rather, her research involves weighing options - "why we would mine," she said, "and why we wouldn't."
Humans need resources that the deep sea could provide. Van Dover pointed out that, like many people, she owns a cellphone, which requires rare metals to function. Deep-sea mining, though, raises several environmental questions. "What are you going to do with the wastewater?" she said. Van Dover described vent ecosystems as "robust," but deep-sea conservationists do not yet know what the cumulative impact of mining might be on these habitats.
One fear is that the ocean will lose something humans never knew existed. The worms that lack digestive tracts are something of a biological marvel, among the seafloor's oddest animals. Was it just luck, Van Dover wondered, that these creatures happened to live near the first hydrothermal vents humans ever encountered?
Put another way: Is there something out there, skittering beneath a cloud of black smoke, that's stranger still?
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
COMMENTS
Advertisement
220-Foot NF 2024 Asteroid Racing Towards Earth, NASA Alerts NASA Transmits Missy Elliott's Hip-Hop Song To Venus At Speed Of Light "Cosmic Ballet": 2 Galaxies Merge In Space, Webb Telescope Sends In Pics Why BJP Lost Lok Sabha Polls In Uttar Pradesh - 6 Reasons In Party Report World's Largest Isolated Tribe Makes Rare Appearance In New Footage Puja Khedkar's Father Was Suspended Twice On Extortion Complaints Watch: Ashneer Grover's Reaction To 22-Year-Old's Monthly Earning Viral IIT Kanpur Introduces 'SATHEE SSC' Platform For Exam Preparation IIT Kanpur Introduces 'SATHEE SSC' Platform For Exam Preparation Track Latest News Live on NDTV.com and get news updates from India and around the world.