首页
登录
职称英语
Mars with its orange-red colour has fascinated people since ancient times. I
Mars with its orange-red colour has fascinated people since ancient times. I
游客
2024-08-12
47
管理
问题
Mars with its orange-red colour has fascinated people since ancient times. Its name derives from the Roman god of war. The planet is similar to Earth in a number of ways. For example, a day on Mars is about the same length as a day on Earth. Also the tilt of Mars’ axis is about the same as that of Earth so it has similar seasons.
However, temperatures are much lower than on Earth—below the freezing temperature of water even in summer with average daily temperatures of about 60 degrees Celsius. The cold is due to the lack of heating from the Sun and the lack of greenhouse warming from gases in the thin atmosphere.
What can you see?
Mars will be a very prominent object in the night sky in August and September. Not only will it be the brightest object apart from the moon, but its reddish colour will make it easy to find.
In July Mars was rising in the east a few hours after sunset. By late August it will be rising around sunset.
To see Mars through a telescope during its close approach, contact your local public observatory, amateur astronomical society or planetarium. Most of them are likely to hold viewing sessions.
Mars is a small planet, half the size of Earth. When it is distant from us it appears as a tiny featureless reddish disc even when viewed through a telescope. At oppositions the disc of Mars appears larger and features can be seen on its surface.
These features include the polar caps and dark markings. Mars may also have a dust storm raging on its surface. While this sounds exciting, it can make the appearance of the planet disappointing.
Water on Mars
Though there is no liquid water on the surface, close-up photographs of Mars reveal winding valleys and channels. These indicate the existence of running water in the past.
Scientists using NASA’s Mars Odyssey spacecraft, currently in orbit around Mars, have discovered large quantities of water ice under the planet’s surface. They found that in regions of Mars surrounding the south pole the top one meter of soil has more than 50% water by volume. An instrument called the gamma ray spectrometer detected the water by searching for the signature of hydrogen in radiation coming from the planet. As hydrogen is an essential component of water and the hydrogen-rich regions are in the coldest regions of the planet, the scientists concluded that the hydrogen indicated the presence of water ice.
Summary:
The Mars and the Earth have much in common, such as similar length of a day and similar【51】However, the temperature is【52】on Mars than that on Earth. In August and September, Mars is the brightest object in the night sky secondary to【53】. ff you want to observe the Mars, you can contact your local public observatory, amateur astronomical society or planetarium, who are likely to provide viewing sessions. At oppositions the Mars appears larger and【54】can be seen on its surface. Evidence show that there is no liquid water on the Mars but【55】was detected, which is an essential element of water. [br]
选项
答案
the moon
解析
(文章第七段提到Mars will be a very prominent object in the night sky in August and September. Not only will it be the brightest object apart from the moon, 由此可知Mars的亮度是接近月亮的。)
转载请注明原文地址:https://tihaiku.com/zcyy/3717199.html
相关试题推荐
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.
"Notuntilsciencebecameprominent______beabolished",somepeopleargue.A、did
Democracyisnotanewconception.TheancientAthenians【M1】______hadade
Democracyisnotanewconception.TheancientAthenians【M1】______hadade
Democracyisnotanewconception.TheancientAthenians【M1】______hadade
Democracyisnotanewconception.TheancientAthenians【M1】______hadade
Democracyisnotanewconception.TheancientAthenians【M1】______hadade
Thearmywasseeminglyvictorious,butsincemanypeoplelosttheirlives,itwa
随机试题
______isknownastheautomaticcapitaloftheworld.A、ClevelandB、ChicagoC、Ph
U.S.EarlyChildhoodEducationFiftyyearsago,【T1】______attendedearly
AsanimmigranttoNorthAmerican,youwillneedtoensurethatemployersand
[originaltext]ApublicopinionstudysaysthatmostAmericanswouldaccept
[originaltext]M:Ouch,howcanthesandbesohotwhenthewater’sstillcold?
一台PC机通过调制解调器与另一台PC机进行数据通信,其中PC机属于(),调制解
A非常喜欢吃汉堡包,假如他吃第一个汉堡包获得的边际效用是10,那么他吃第二个汉堡
A.亚硝酸钠法 B.双相滴定法 C.旋光法 D.溴量法 E.银量法异戊巴
以下药物相互作用,可能主要影响临床药效学的是A.敏感化作用 B.保护药品不受破
下列关于企业员工取得与股票期权相关所得计征个人所得税的表述中,符合税法规定的是(
最新回复
(
0
)