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completely disappear.This could allow exoplanets to be detected at much greater distancesthan current optical light transit studies,which must be able to detect tiny decreases in lightbecause the planet only blocks a tiny part of the star.The team used this method to detect the exoplanet candidate in a binary systemcalled M51-ULS-1,located in M51.This binary system contains a black hole or neutronstar or biting a companion star with a mass about 20 times that of the sun.The X-ray transitthey found using Chandra data lasted about three hours,during which the X-ray emissiondecreased to zero.Based on this and other information,the researchers estimate the exoplanetcandidate in M51-ULS-1 would be roughly the size of Saturn,and orbit the neutron star orblack hole at about twice Saturn's distance from the sun.While this is a tantalizing(引起好奇心的)study,more data would be needed to confirmthe understanding as an extragalactic(银河系外的)exoplanet..One challenge is that theplanet candidate's large orbit means it would not cross in front of its binary partner again forabout 70 years,thwarting()any attempts for a confirming observation for decades.28.What is the significance of the new finding for future study?A.It has distinctive result.B.It opens up exploration at longer distance.C.It uses NASA's Chandra X-ray Observatory.D.It detects a star outside of the Milky Way for the first time.29.According to Rosanne Di,how did they try to find exoplanets?A.By using X-ray wavelengths to look for exoplanets.B.By discovering exoplanets in other galaxies.C.By opening up a whole new arena.D.By finding other worlds.30.What does this refer to in paragraph 4?A.Chandra dataB.X-ray emissionC.The decrease of X-rayD.The X-ray transit that lasted three hours31.What's the team's future focus?A.Thwart attemptsB.Tantalize the studyC.Confirm observationD.Find more informationDFiguring out biodiversity patterns and detecting rare or just-good-at-hiding species haslong posed challenges for ecosystem monitoring and conservation efforts.Traditional survey高二英语试卷第6页共11页