New Study Examines Whether Venus Had Liquid Water
2024-12-09
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1A new study suggests that Venus likely never had water flowing on its surface.
2The research was based on data related to the chemical makeup of the planet's atmosphere.
3Scientists have long considered whether Venus once held liquid water, even possibly large oceans.
4Such research was based on the fact that Venus is like our own planet in many ways.
5It is a rocky planet similar in structure and size to Earth and is also our closest planetary neighbor.
6But the latest study provides evidence that Venus has likely always been the hot, extremely dry planet it remains today.
7Researchers from Britain's University of Cambridge led the study.
8It recently appeared in the publication Nature Astronomy.
9The researchers' data examinations led them to conclude that both the surface and interior of Venus remain dry.
10The team said the strongest evidence that Venus once had large amounts of water would be the discovery of some water inside the planet today.
11But the study provided no evidence of that.
12Since water is considered an important element for supporting life, the researchers also suggest that Venus was likely never habitable, or able to support life.
13The lead writer of the study was Tereza Constantinou, a doctoral student at the University of Cambridge's Institute of Astronomy.
14She told Reuters news agency, "We suggest that a habitable past would be associated with Venus' present interior being water-rich, and a dry past with Venus' present interior being dry."
15The researchers explained they attempted to measure the current destruction rate of molecules in water, carbon dioxide and carbonyl sulfide in Venus' atmosphere.
16The state of the planet's atmosphere is linked to volcanic activity, the team said.
17"Volcanism, through its supply of gases to the atmosphere, provides a window into the interior of rocky planets like Venus," the researchers wrote in a statement.
18"As magma rises from the mantle to the surface, it releases gases from the deeper portions of the planet.
19Volcanic explosions, or eruptions, can provide information on the amount of water contained deep below a planet's surface, the scientists said.
20On Earth, for example, volcanic eruptions mostly release steam, a vapor created when water gets heated.
21Measurements of volcanic gases on Earth have shown they release about 60 percent water vapor.
22But the researchers said their examinations suggested volcanic gases released on Venus were less than 6 percent water vapor.
23This persuaded the team to conclude that the planet's interior - the source of the magma that releases volcanic gases - must be very dry.
24The team noted that scientists have had two leading theories on the history of water on Venus.
25The first is that the planet had a moderate climate for billions of years, with liquid water flowing over areas of the surface.
26Over time, widespread volcanic activity likely led to extreme heat and dry conditions that made the water disappear.
27The second theory imagined Venus as being very hot from the beginning, preventing liquid water from ever forming on the surface.
28Constantinou said, "Both of those theories are based on climate models, but we wanted to take a different approach based on observations of Venus' current atmospheric chemistry."
29She added that the team did not find evidence that any chemicals being removed from the atmosphere were later being restored.
30This provides strong evidence that Venus has a very dry interior today, the scientists concluded.
31"The atmospheric chemistry suggests that volcanic eruptions on Venus release very little water, implying that the planet's interior...is equally dry," Constantinou said.
32She added that her team "would have loved to find that Venus was once a planet much closer to our own."
33However, Constantinou noted the finding suggests that researchers should center their searches "on planets that are mostly likely to be able to support life - at least life as we know it."
34I'm Bryan Lynn.
1A new study suggests that Venus likely never had water flowing on its surface. The research was based on data related to the chemical makeup of the planet's atmosphere. 2Scientists have long considered whether Venus once held liquid water, even possibly large oceans. Such research was based on the fact that Venus is like our own planet in many ways. It is a rocky planet similar in structure and size to Earth and is also our closest planetary neighbor. 3But the latest study provides evidence that Venus has likely always been the hot, extremely dry planet it remains today. Researchers from Britain's University of Cambridge led the study. It recently appeared in the publication Nature Astronomy. 4The researchers' data examinations led them to conclude that both the surface and interior of Venus remain dry. The team said the strongest evidence that Venus once had large amounts of water would be the discovery of some water inside the planet today. But the study provided no evidence of that. 5Since water is considered an important element for supporting life, the researchers also suggest that Venus was likely never habitable, or able to support life. 6The lead writer of the study was Tereza Constantinou, a doctoral student at the University of Cambridge's Institute of Astronomy. She told Reuters news agency, "We suggest that a habitable past would be associated with Venus' present interior being water-rich, and a dry past with Venus' present interior being dry." 7The researchers explained they attempted to measure the current destruction rate of molecules in water, carbon dioxide and carbonyl sulfide in Venus' atmosphere. The state of the planet's atmosphere is linked to volcanic activity, the team said. 8"Volcanism, through its supply of gases to the atmosphere, provides a window into the interior of rocky planets like Venus," the researchers wrote in a statement. "As magma rises from the mantle to the surface, it releases gases from the deeper portions of the planet. 9Volcanic explosions, or eruptions, can provide information on the amount of water contained deep below a planet's surface, the scientists said. 10On Earth, for example, volcanic eruptions mostly release steam, a vapor created when water gets heated. Measurements of volcanic gases on Earth have shown they release about 60 percent water vapor. 11But the researchers said their examinations suggested volcanic gases released on Venus were less than 6 percent water vapor. This persuaded the team to conclude that the planet's interior - the source of the magma that releases volcanic gases - must be very dry. 12The team noted that scientists have had two leading theories on the history of water on Venus. The first is that the planet had a moderate climate for billions of years, with liquid water flowing over areas of the surface. Over time, widespread volcanic activity likely led to extreme heat and dry conditions that made the water disappear. 13The second theory imagined Venus as being very hot from the beginning, preventing liquid water from ever forming on the surface. 14Constantinou said, "Both of those theories are based on climate models, but we wanted to take a different approach based on observations of Venus' current atmospheric chemistry." She added that the team did not find evidence that any chemicals being removed from the atmosphere were later being restored. 15This provides strong evidence that Venus has a very dry interior today, the scientists concluded. "The atmospheric chemistry suggests that volcanic eruptions on Venus release very little water, implying that the planet's interior...is equally dry," Constantinou said. 16She added that her team "would have loved to find that Venus was once a planet much closer to our own." However, Constantinou noted the finding suggests that researchers should center their searches "on planets that are mostly likely to be able to support life - at least life as we know it." 17I'm Bryan Lynn. 18Bryan Lynn wrote this story for VOA Learning English, based on reports from Reuters and the University of Cambridge. 19___________________________________________ 20Words in This Story 21magma - n. hot liquid rock found just below the surface of the Earth 22mantle - n. a layer of something that covers a surface 23vapor - n. many small drops of liquid that form in the air 24approach - n. the way something is done 25imply - v. to communicate an idea or feeling without saying it directly