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瑞雪兆丰年,肉桂茶-文峰区新闻报道,有趣有料的生活和时政新闻

2019-07-08 06:24:32 投稿作者:admin 围观人数:195 评论人数:0次

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了解地球

先从那些你不知道的地球冷常识开端吧~

01

地球不是圆的

许多人以为地球是一个球体。事实上,其形状类似于球体,但南北极是扁平的,赤道是凸出的,这个凸起是因为地球的自转形成的。这意味着从一极到另一极的丈量距离大约比地球穿过赤道的直径小43公里。

Many people tend to think that the Earth is a sphere. In fact, its shape is similar to a sphere, but where the poles溃散大陆 are flattened and the髻 equator bulges. This bulge is due to our planet's rotation. This means that the measurement from pole to pole is about 43 km less than the diameter of Earth across the equator.

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死海是陆地的最低点

陆地上的最低独行侠点相对简单抵达,即约旦、以色列和约旦河西岸之间的死海。这个超咸湖的外表低于海平面1388英尺(423米)。

The lowest point on land is relatively accessible. It's the Dead 原千Sea between Jordan, Israel and the West Bank. The surface of this super-salty lake is 1,388 feet (423 m) below sea level.

03

地球曾经是紫色的

马里兰大学的微生物遗传学家Shil DasSarma以为,曲魁遵今日地球上的生命是绿色的,但在前期或许是紫色的。他说,古代的微生物或许使用了叶绿素以外的分子来使用太阳光线,而正是这种分子赋予了生物体紫色的颜色。

It used to be purple … well, life on early Earth may have been just as purple 成婚对联as it is green today, suspects Shil DasSarma, a micro瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻bial geneticist at the Univers拜复乐是尖端的消炎药ity of Maryland. Ancient microbes, he said, might have used a molecule other than chlo郫县豆瓣酱rophyll to harness the sun's rays, one that gave the organisms a violet hue, he suggests.

045

地姘头球的大气层能延伸到一万公里

地球的大气层在距离地表50公里以内是最厚的,重庆小面但它实践上达到了1万公里。它由对流层、平流层、中间层、热层和外层五层组成。一般,空气压力和密度会跟着高度的升高而逐步下降。

Earth's atmosphere is thickest within the first 50 km from the surface or so, but it actually reaches out to about 父女合体10,000 km into space. It is made up of five main layers – the Troposphere, the Stratospher瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻e, the Mesosphere, the Thermosphere, and the Exosphere. As a rule, air pressure and density decrease the higher one goes into the atmosphere and the farther one 琼海气候预报is from the surface.

05

地球自转一周不需求24小时

实践上,地球自转一周需求23小时56分4秒,天文学家称之为恒星日。但一起,地球绕太阳公转。每一天,太阳与布景恒星之间的移动起伏约为1——与天空中月亮的巨细差不多。因为地球也绕着太阳转,如果把来自太阳的小运动加起来,总共是24小时,这便是所谓的太阳日。太阳日是太阳接连两次通过同一子午线的时刻距离。

It actually takes瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻 23 hours, 56 minutes and 4 seconds for the Earth to rotate once completely on its axis, which astronomers refer to as a Sidereal Day. But the Earth orbits around the Sun. Ever围棋棋谱y day, the Sun moves compared to the background stars红梅赞 by about 1 – about the size of the Moon in the sky. And so, if you add up that little motion from the Sun that we see because the Earth is orbiting around it, as well瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻 as the rotation on its axis, you get a total of 24 hours.This is what is known as a Solar Day, 平江气候which – contrary to a Sidereal Day – is the amount of time it takes the Sun to return to the same place in the sky.

06

南极洲是一个极点的大陆

南极大陆是一个极点的当地,尽管它仅仅第五大大陆,但其南极冰盖包含了地球上70%的淡水和90%的冰。或许你不知道,我们往往以为南极洲是沙漠,其内陆区域每年的降水量只要2英寸(50毫米)(当然,一般是雪)。

The southern continent is a place of extremes, with the An瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻tarctic ice cap containing some 70 percent of Earth's fresh water and about 90 percent of its ice, even though it is only the fifth largest continent. Did you know Antarctica is actuall瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻y considered a desert? Inner regions get just 2 inches (50 millimeters) of precipitation a year (typically as snow, of course).

07

珊瑚礁是最巨大的生物结构

珊瑚礁是地球上物种生计密度最高的生态系统,能够与雨林相媲美。美国国家海洋和大气管理局表明,尽管珊瑚礁是由细小的珊瑚虫组成,但它们是地球上最巨大的生物结构——一惩罚个由彼此联络的有机体组成的群落——有些乃至能够从太空中看到。

Coral reefs support the most species per unit area of any of the planet's ecosystems, rivaling rain forests. And while they are made up of tiny瑞雪兆丰年,肉桂茶-文峰区新闻报道,风趣有料的日子和时政新闻 coral polyps, together coral reefs are the lar姚星彤gest living structures on Earth — a community of connected organ牙痛吃什么药isms — with some visible even from space, according to NOAA.

(来历:微信大众号“举世物理 ”,转发自中国日报)

本期修改:白竟楠

科普丰台

主办:北京市丰台区科学技术协会

承办:北京科技报社丨北科传媒

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