More Information about Little-Known Venus
2021-05-15
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1A recent study of Earth's closest planetary neighbor has provided new understanding about Venus.
2Recently, scientists gathered data about Venus by bouncing radio waves off the planet.
3The study measured the tilt of the Venusian axis and size of the planet's center, or core.
4It also studied the planet turning.
5All this data is giving a deeper understanding of the strange planet, sometimes called Earth's "evil twin."
6It was already known that Venus has the longest day.
7The time the planet takes for one full turn, or rotation, on its axis is longer than any other planet in our solar system.
8However, some earlier estimates were not completely correct.
9The study found that a single Venusian rotation takes about 243 Earth days.
10That means a day on Venus lasts longer than a year on Earth.
11Scientists also say that Venus makes a complete orbit around the sun in 225 Earth days.
12The researchers sent radio waves toward Venus 21 times from 2006 to 2020 from NASA's Goldstone Antenna in the Mojave Desert of California.
13Then they studied the radio echo, the sound that traveled back to two places on Earth: Goldstone and at the Green Bank Observatory in West Virginia.
14Jean-Luc Margot is a planetary astronomy professor at the University of California, Los Angles.
15He led the study.
16The findings were published online by Nature Astronomy.
17He said the radio waves lit up Venus with a huge "flashlight."
18The scientists then observed the reflections as they came back to Earth.
19Margot praised Venus as an excellent "laboratory" for understanding how planets are formed and how they change.
20"There are likely billions of Venus-like planets in the galaxy," he said.
21The new data showed that the Venusian planetary core is about 7,000 kilometers (4,360 miles) across.
22That is similar in size to the Earth's core.
23Earlier estimates of Venus's core were based on computer modeling rather than observational data.
24Its core is very likely made of iron and nickel.
25However, Margot said that it is unclear whether the core is solid or liquid.
26Venus, the second planet from the sun, is similar in structure but slightly smaller than Earth.
27The planet is about 12,000 kilometers wide.
28Its poisonous atmosphere is mainly made up of carbon dioxide, with clouds of sulfuric acid.
29This creates a greenhouse effect.
30So, its surface temperatures can reach 471 degrees Celsius.
31That is hot enough to melt lead.
32Venus turns on its axis almost upright.
33This means it lacks separate seasons.
34The Earth has more of a tilt.
35The study found that the Venusian tilt is about 2.64 degrees.
36Earth's is about 23.5 degrees.
37Venus turns from east to west.
38This is the opposite direction from all other planets in our solar system except Uranus.
39Here is another strange thing about Venus: the time between sunrises (as opposed to the length of a single axial turn) takes 117 Earth days.
40This is because Venus rotates in the direction opposite of its orbit around the sun.
41Venus has received less attention than Mars, Earth's other planetary next-door neighbor, and other places in the solar system.
42Margot said this extreme lack of data about Venus has led to an extreme lack of understanding.
43"There have been no NASA missions to Venus in almost 30 years and about a dozen NASA missions to Mars in this time ...," Margot said.
44He added that the new findings on how Venus turns could help any future landing attempts.
45I'm Anna Matteo.
1A recent study of Earth's closest planetary neighbor has provided new understanding about Venus. 2Recently, scientists gathered data about Venus by bouncing radio waves off the planet. The study measured the tilt of the Venusian axis and size of the planet's center, or core. It also studied the planet turning. 3All this data is giving a deeper understanding of the strange planet, sometimes called Earth's "evil twin." 4It was already known that Venus has the longest day. The time the planet takes for one full turn, or rotation, on its axis is longer than any other planet in our solar system. However, some earlier estimates were not completely correct. 5The study found that a single Venusian rotation takes about 243 Earth days. That means a day on Venus lasts longer than a year on Earth. Scientists also say that Venus makes a complete orbit around the sun in 225 Earth days. 6The researchers sent radio waves toward Venus 21 times from 2006 to 2020 from NASA's Goldstone Antenna in the Mojave Desert of California. Then they studied the radio echo, the sound that traveled back to two places on Earth: Goldstone and at the Green Bank Observatory in West Virginia. 7Jean-Luc Margot is a planetary astronomy professor at the University of California, Los Angles. He led the study. The findings were published online by Nature Astronomy. 8He said the radio waves lit up Venus with a huge "flashlight." The scientists then observed the reflections as they came back to Earth. 9Margot praised Venus as an excellent "laboratory" for understanding how planets are formed and how they change. 10"There are likely billions of Venus-like planets in the galaxy," he said. 11The new data showed that the Venusian planetary core is about 7,000 kilometers (4,360 miles) across. That is similar in size to the Earth's core. Earlier estimates of Venus's core were based on computer modeling rather than observational data. Its core is very likely made of iron and nickel. However, Margot said that it is unclear whether the core is solid or liquid. 12Venus, the second planet from the sun, is similar in structure but slightly smaller than Earth. The planet is about 12,000 kilometers wide. 13Its poisonous atmosphere is mainly made up of carbon dioxide, with clouds of sulfuric acid. This creates a greenhouse effect. So, its surface temperatures can reach 471 degrees Celsius. That is hot enough to melt lead. 14Venus turns on its axis almost upright. This means it lacks separate seasons. The Earth has more of a tilt. The study found that the Venusian tilt is about 2.64 degrees. Earth's is about 23.5 degrees. 15Venus turns from east to west. This is the opposite direction from all other planets in our solar system except Uranus. 16Here is another strange thing about Venus: the time between sunrises (as opposed to the length of a single axial turn) takes 117 Earth days. This is because Venus rotates in the direction opposite of its orbit around the sun. 17Venus has received less attention than Mars, Earth's other planetary next-door neighbor, and other places in the solar system. Margot said this extreme lack of data about Venus has led to an extreme lack of understanding. 18"There have been no NASA missions to Venus in almost 30 years and about a dozen NASA missions to Mars in this time ...," Margot said. He added that the new findings on how Venus turns could help any future landing attempts. 19I'm Anna Matteo. 20Will Dunham reported this story for Reuters. Anna Matteo adapted it for VOA Learning English. Caty Weaver was the editor. 21_____________________________________________________ 22Words in This Story 23data - n. facts about something that can be used in calculating, reasoning, or planning 24tilt - v. to move or shift so as to slant or tip 25axis - n. the imaginary straight line that something (such as the Earth) turns around 26spin - v. to turn or cause someone or something to turn around repeatedly 27rotation - n. the action or process of rotating on or as if on an axis or center 28reflection - n. an image that is seen in a mirror or on a shiny surface 29galaxy - n. any of the very large groups of stars and associated matter that are found throughout the universe 30diameter - n. mathematics : the length of a straight line through the center of an object or space 31greenhouse effect - n. warming of the lower atmosphere of the earth that occurs when radiation from the sun is absorbed by the earth and then given off again and absorbed by carbon dioxide and water vapor in the atmosphere gases 32mission - n. a definite military, naval, or aerospace task