首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
How many planets are there in the solar system revolving around the sun?
How many planets are there in the solar system revolving around the sun?
admin
2019-10-21
43
问题
How many planets are there in the solar system revolving around the sun?
Earth is one of nine planets which revolve(绕转)around the sun. This family of planets, with their moons, is known as the solar system. Since we live on Earth, we think it is the most important planet. But the other planets are also interesting. Some are smaller than Earth, some larger;some are hotter , some colder. Each one is different from all the others and has something special about it. No one knows for certain how the solar system began. We do know a lot about the planets, however, from the science of astronomy(天文学). Astronomers have done research on the planets and other objects in space for thousands of years. Astronomy is a very complicated science. We look at the other planets to study them, but the planet we are on is moving all the time. Computers have helped us in the past twenty or thirty years. The satellites we sent into space to measure and take pictures also tell a lot a-bout the planets and help us to understand them.
Mercury(水星)is the closest planet to the sun. It is also the smallest and fastest planet. The speed of the planet gave it its name: Mercury was the rapid messenger of the Roman gods. Mercury completes its orbit around the sun in only 88 days, while Earth’s orbit takes 365 — days. A day on Mercury, however, is much longer than a day on Earth. Earth rotates on its axis once every 24 hours. Mercury rotates on its axis once every 59 days.
Venus(金星)is the second planet in distance from the sun. It is about the same size as Earth, and it comes closer to Earth than any other planets. Next to the sun and the moon, Venus is the easiest object in the sky to see. People of ancient times loved its brightness and beauty so much that they named it after the Roman goddess of love and beauty.
Venus revolves around the sun once every 225 days and rotates on its axis once every 224 days. Information from telescopes and satellites shows us that the planet is very hot. The temperature is usually between 300 and 675 degrees Celsius. We can observe both Venus and Mercury either in the evening or early in the morning just before the sun rises.
Mars(火星)is called the red planet because of its definite(明确的)red-orange color. It is the fourth farthest planet from the sun. A day on Mars is only about 40 minutes longer than a day on Earth, but a year lasts 687 days. The planet was named after the Roman god of war.
For many years, people believed that there was life on Mars, but we now know that there probably isn’t. The Mariner space program sent many satellites to Mars. We have excellent photos and information on this neighbor planet, and nothing suggests that there is any life there.
The fifth planet from the sun is also the largest of all the planets, Jupiter(木星). Jupiter revolves around the sun once every 12 years, yet its day is amazingly(惊人地)short. Its rotation, or its day, is only about 10 hours long. This is the fastest rotation—the shortest day—of any of the planets.
The planet’s name is appropriate, since Jupiter was the largest Roman god—the king of all the other gods. If you can imagine Jupiter as a hollow ball, all of the other planets would fit inside and there would still be a lot of room left. Jupiter has fourteen moons, the largest number of any planets.
选项
答案
Astronomy
解析
转载请注明原文地址:https://kaotiyun.com/show/6eWd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Oneofthemostimportantsocialdevelopments(31)helpedtomakepossibleashiftinthinkingabouttheroleofpubliceducatio
Oneofthemostimportantsocialdevelopments(31)helpedtomakepossibleashiftinthinkingabouttheroleofpubliceducatio
Oneofthemostimportantsocialdevelopments(31)helpedtomakepossibleashiftinthinkingabouttheroleofpubliceducatio
Oneofthemostimportantsocialdevelopments(31)helpedtomakepossibleashiftinthinkingabouttheroleofpubliceducatio
AnswerquestionsbyreferringtothefollowingarticleaboutIstanbul. Note:Whenmorethanoneanswerisrequired,thesemay
Whichofthefollowingcanproducethestrongestshock?Whichofthefollowingstatementsisnottrue?
Theideaofafishbeingabletoproduceelectricitystrongenoughtolightlampbulbs—oreventorunasmallelectricmotor—is
AndrenaGravidaisthenameofawildbeedecliningintheUnitedKingdomandtheNetherlands.A(31)ofmonthsagotherecentd
Whoisplanningtointroducearatingsystemthissummerforuniversitystudents?
A=HallucinogensB=CocaineC=AlcoholWhichdrug...mayslowdownbodyfunction?71.______canleadtothe
随机试题
甲公司采用配股方式进行融资,每10股配2股,配股前股价为6.2元,配股价为5元。如果除权日股价为5.85元,所有股东都参加了配股,除权日股价下跌()。
______是一个能复制一个对象的动画,并应用到其他对象的动画工具。
《医疗机构药事管理暂行规定》的颁布时间为
张某,女,45岁。因胃脘痞闷不适3个月就诊,患者近3个月来经常脘腹痞闷,重时满闷如塞,但不疼痛,饮食减少,恶心嗳气,大便不爽,喜长叹息,有时心烦易怒,胸胁胀满,每因生气恼怒而使症状加重,苔薄白,脉弦。其证型为
可行性研究必须坚持()等原则。
农业税减免包括()、()和()三种形式。
对于证券投资基金来说,其市场参与者有()
基金的流动性风险表现在()。
特别重视强化作用的教学理论流派有()
Archaeologyasaprofessionfacestwomajorproblems.First,itisthepoorestofthepoor.Onlypaltrysumsareavailablefore
最新回复
(
0
)