首页
登录
职称英语
In its first month orbiting Saturn, the Cassini spacecraft has detected a ne
In its first month orbiting Saturn, the Cassini spacecraft has detected a ne
游客
2023-11-09
10
管理
问题
In its first month orbiting Saturn, the Cassini spacecraft has detected a new radiation belt in an unexpected place, its invisible swarm of trapped high-energy particles circling the planet inside the inner edge of Saturn’s signature disk of luminous rings.
Scientists who reported the discovery said yesterday that they were surprised to find a relatively small radiation belt completely isolated from a planet’s main radiation belts, which lie at much greater distances. They had not expected that such a concentration of energetic particles could be sustained inside the famous Saturnian rings.
The phenomenon of a single isolated belt, the scientists said, has never been observed at any other planet in the solar system. By contrast, the Van Allen belts of Earth consist of two related regions of intense radiation trapped by the planet’s magnetic field.
In a NASA conference call with reporters, Dr. Donald G. Mitchell, a Cassini mission scientist from Johns Hopkins University, said the newly discovered radiation belt was detected as the spacecraft made its closest approach to Saturn immediately after rocketing into its orbit on July 1. No previous spacecraft visiting Saturn had been in the proper position to make such a discovery.
Dr. Mitchell said it was the spacecraft’s imaging magnetometer that had observed the radiation belt, which extended around Saturn from about 15,000 miles above the planet’s cloud tops to the inner edge of the innermost of its spectacular rings. The belt is much smaller, and the energies of its particles are less intense, than Saturn’s main radiation belts.
With its discovery, Dr. Mitchell said, "we have seen something that we did not expect: that radiation belt particles can hop over obstructions like Saturn’s rings."
Other Cassini mission scientists reported puzzling patterns of lightning and thunderstorms on Saturn and observations of a striking glow emanating day and night from the planet’s largest moon, Titan. [br] In the last paragraph, "emanating"could be replaced by these words EXCEPT
选项
A、spurting.
B、emitting.
C、effusing.
D、diffusing.
答案
A
解析
emanating指“发出,散发或发射出”,虽然四个选项意思都是“发射出”,但spurting不能用于光线,而是水等液体,所以A为最佳答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3171874.html
相关试题推荐
Thermalexpansionofsolidis______detectedbyournakedeyes.A、smallsoasno
InitsfirstmonthorbitingSaturn,theCassinispacecrafthasdetectedane
InitsfirstmonthorbitingSaturn,theCassinispacecrafthasdetectedane
InitsfirstmonthorbitingSaturn,theCassinispacecrafthasdetectedane
InitsfirstmonthorbitingSaturn,theCassinispacecrafthasdetectedane
InitsfirstmonthorbitingSaturn,theCassinispacecrafthasdetectedane
Howtalldidthespacecraftmakethefreefall?[br][originaltext]Ifonero
Howtalldidthespacecraftmakethefreefall?[originaltext]Ifonerockets
Themerchantspacecraftismeantto[br][originaltext]It’s60feetlong,m
Themerchantspacecraftismeantto[originaltext]It’s60feetlong,madeof
随机试题
弹簧管压力表量程偏大时应( )。A.逆时针转动机芯 B.顺时针转动机芯
质量功能部署(QualityFunctionDeployment,QFD)将
肠道传染病是由于()引起的。A.别人与你接触传染 B.遗传 C.吃了不
继承和弘扬中华民族优良道德能够() A、提高民族自尊心和民族自信心,增强民族自
不属于教师道德品质范畴的是A.忠诚与节操 B.正直与自制 C.勤奋与求
A.手术治疗 B.持续牵引 C.推拿按摩 D.硬脊膜外封闭 E.绝对卧床
制定劳动力市场工资指导价位时,应( )。A.坚持市场取向 B.优先考虑企业
按照企业定价时侧重考虑因素的不同,可将定价方法分成()。A.成本导向定价法
征信服务中心收到商业银行重新报送的更正信息后,应当在()个工作日内对异议信息
《商业银行合规风险管理指引》所称的法律、规则和准则不包括()。A.银行业经营活
最新回复
(
0
)