A new study focuses on K2-l8 b，an exoplanet（系外行星） discovered in 2018，which orbits a red dwarf star close enough to receive about the same amount of radiation from its star as Earth does from our sun．
Recently，scientists have discovered gas giants that have water in their atmospheres，but this is the least giant planet ever to have water detected in its atmosphere． "The water detection was quite clear to us relatively early on， "lead author Bjorn Benneke，a professor at the Institute for Research on Exoplanets at the Universite de Montreal，told Space．com in an interview．
"Studies have suggested that planets with hydrogen-rich atmospheres could host certain forms of life．" Benneke said．However， "K2-18 b's large atmosphere is extremely thick and creates high-pressure conditions，which likely prevents life as we know it from existing on the planet's surface．" a news release reads．While these researchers found evidence for liquid water clouds on K2-18 b，because of its lack of surface，rain wouldn't pool on the planet．Without a real surface，so to speak，landing on the planet would also be nearly impossible to land on，especially because the gas is so thick and has such an incredibly high pressure that any Earth-created spacecraft sent there would be destroyed．
Benneke suggests that，possibly，this planet formed by rock absorbing large amounts of gas， "like a vacuum cleaner， "he said．The gas absorbed would have more than doubled the planet and increased its volume eightfold．
To come to these conclusions，the research team analyzed data from Hubble Space Telescope observations that they made between 2019 and 2020 of the K2-18 b planet passing in front of its star eight times．This type of research，Benneke said，is leading toward a final goal of "being able to study real，true earth-like planets"． "We are not quite there yet， "he said，"but this is really exciting．"
（1）Why is it impossible to land on the K2-18 b？ BB
A．It has thin gas．
B．It doesn't have a real surface．
C．It has too much water．
D．It is too far from the earth．
（2）How does K2-18 b expand according to Benneke？ CC
A．By releasing gas itself．
B．By receiving radiation from the sun．
C．By taking in much gas by rocks．
D．By getting away from the red dwarf star．
（3）What can we infer from the last paragraph？ AA
A．Scientists are making progress in studying real earth-like planets．
B．It is impossible for humans to land on other earth-like planets．
C．Scientists have succeeded in exploring K2-18 b completely．
D．The K2-18 b planet has passed before its star eight times between 2019 and 2020．
【答案】B；C；A
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：1引用：1難度：0.5
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