On Jupiter's Moon Europa, Earth-like Landforms Suggest Conditions for Life
2022-04-25
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1Similarities between formations on Europa and a landform in Greenland suggest Jupiter's moon may be able to support life.
2A study published recently compared long landforms called double ridges on Europa's surface to similar but smaller landforms in Greenland.
3The double ridges look like huge cuts across Europa's surface.
4They have two long mountain tops and a central valley between them.
5Stanford University geophysicist Riley Culberg is the lead writer of the study published in the publication Nature Communications.
6 Describing the landforms, he said that if you cut through a double ridge, it would look like a capital "M."
7Radar data showed that refreezing of liquid water below the surface of the ground drove the formation of Greenland's double ridge.
8If Europa's formations were created the same way, it might mean there are large amounts of liquid water near Europa's surface.
9Liquid water is believed to be necessary for life to exist.
10Europa has gained scientists' attention in the past as a possible place for life outside of Earth.
11That is because research has suggested that a saltwater ocean is under its ice-covered surface.
12Smaller areas of water closer to the surface in the double ridges would represent a second possible place for small organisms to live.
13"The presence of liquid water in the ice shell would suggest that exchange between the ocean and ice shell is common, which could be important for chemical cycling that would help support life," Culberg said.
14He added that surface-level water would be easier for future space missions to study than the deep ocean.
15The U.S. space agency NASA is sending a space vehicle called Europa Clipper to Jupiter's moon.
16The launch is planned for 2024. Europa Clipper's goal is to study if the moon has conditions able to support life.
17The water in the double ridges is within one kilometer of the surface.
18Those areas are near chemicals on the surface that could support the formation of life.
19Europa is 3,100 kilometers across, a little smaller than Earth's moon.
20But Europa's ocean might contain two times the amount of water that is in Earth's oceans.
21Scientists believe that the first life on Earth was small organisms found in the ocean.
22Europa's double ridges are sometimes hundreds of kilometers long.
23They are 150 to 200 meters tall, and the tops of the ridges are one half to one kilometer apart.
24Scientists have debated how they formed.
25Culberg noticed their similarity to a landform he knew in northwestern Greenland.
26Culberg said the Greenland double ridge formation was created by repeated refreezing, pressurization, and fracturing of a near-surface body of water.
27He added that there are two ridges because the near-surface water is also split into two bodies.
28If the same process created Europa's double ridges, each near-surface body of water could have as much water as Lake Erie, one of North America's Great Lakes.
29Stanford geophysics professor Dustin Schroeder helped write the study.
30He noted that water "makes this moon a very exciting candidate for habitability..."
31I'm Gregory Stachel.
1Similarities between formations on Europa and a landform in Greenland suggest Jupiter's moon may be able to support life. 2A study published recently compared long landforms called double ridges on Europa's surface to similar but smaller landforms in Greenland. 3The double ridges look like huge cuts across Europa's surface. They have two long mountain tops and a central valley between them. 4Stanford University geophysicist Riley Culberg is the lead writer of the study published in the publication Nature Communications. Describing the landforms, he said that if you cut through a double ridge, it would look like a capital "M." 5Radar data showed that refreezing of liquid water below the surface of the ground drove the formation of Greenland's double ridge. 6If Europa's formations were created the same way, it might mean there are large amounts of liquid water near Europa's surface. Liquid water is believed to be necessary for life to exist. 7Europa has gained scientists' attention in the past as a possible place for life outside of Earth. That is because research has suggested that a saltwater ocean is under its ice-covered surface. 8Smaller areas of water closer to the surface in the double ridges would represent a second possible place for small organisms to live. 9"The presence of liquid water in the ice shell would suggest that exchange between the ocean and ice shell is common, which could be important for chemical cycling that would help support life," Culberg said. He added that surface-level water would be easier for future space missions to study than the deep ocean. 10The U.S. space agency NASA is sending a space vehicle called Europa Clipper to Jupiter's moon. The launch is planned for 2024. Europa Clipper's goal is to study if the moon has conditions able to support life. 11The water in the double ridges is within one kilometer of the surface. Those areas are near chemicals on the surface that could support the formation of life. 12Europa is 3,100 kilometers across, a little smaller than Earth's moon. But Europa's ocean might contain two times the amount of water that is in Earth's oceans. Scientists believe that the first life on Earth was small organisms found in the ocean. 13Europa's double ridges are sometimes hundreds of kilometers long. They are 150 to 200 meters tall, and the tops of the ridges are one half to one kilometer apart. 14Scientists have debated how they formed. Culberg noticed their similarity to a landform he knew in northwestern Greenland. 15Culberg said the Greenland double ridge formation was created by repeated refreezing, pressurization, and fracturing of a near-surface body of water. He added that there are two ridges because the near-surface water is also split into two bodies. 16If the same process created Europa's double ridges, each near-surface body of water could have as much water as Lake Erie, one of North America's Great Lakes. 17Stanford geophysics professor Dustin Schroeder helped write the study. He noted that water "makes this moon a very exciting candidate for habitability..." 18I'm Gregory Stachel. 19Will Dunham reported this story for Reuters. Gregory Stachel adapted it for VOA Learning English. 20____________________________________________________________________ 21Words in This Story 22ridge - n. a long area of land that is on top of a mountain or hill 23cycle - v. to go through a repeated process or to cause (something) to go through a repeated process 24mission - n. a flight by an aircraft or spacecraft to perform a specific task 25fracture - v. to cause a crack or break in (something hard, such as a bone) 26habitability - n. able to be or possible to live in 27We want to hear from you. Write to us in the Comments section, and visit our Facebook page.