Our Solar System, like all planetary systems, formed from a cloud of gas and dust that surrounded the young Sun 4.5 billion years ago. But our Solar System seems to have a very different structure from the majority of planetary systems discovered over the last few years.像所有的行星系统一...
地球正在与月球疏远一点。据说我们每隔一百万年就会有一秒钟的陌生感,而漫长的分离始于十亿年前。 The earth is drifting away from the moon It is said that every one million years, we have a second of strangeness, and the long separation began a billion years ago ...
54 BILLION YEARSHi! My name is Earth. Some people call meGaia, the blue marble(大理石), the world, or thethird planet from the sun. You can call me PlanetAwesome.I was born 4. 54 billion years ago. I don'tremember what it was like to be a baby. Who does?But I've been told...
5 billion years ago, Mars and Earth began their existence under similar conditions. During the first billion years, liquid water-in contrast to ice-was abundant on the surface of Mars. This is an indication that Mars was much warmer during that time. Mars also had a thicker atmosphere of ...
Since it formed over 4.5 billion years ago, Earth has been hit more people to die of 66.n(starve).61.(occasional) by asteroids (小行星) and comets 62.The new awareness of asteroid impacts has increased the appreciation of orbits bring them into the inner solar system. These objects, ...
14-4The Formation of the Earth Billions of years ago, the sun formed. There was a huge disk of rocks and gases in the solar system. Eventually,these rocks and gases began to form planets. This was about 4.5 billion years ago. Earth was the third planet from the sun. At first, the ...
The Earth’s history has been 45 billion years. Now it can be found in different periods (时期) of different 1 of fossils, and these fossils can 2 the history of our planet earth-shaking changes. Over 200 million years ago, on Earth there 3 a group of animals: the dinosaurs. They ...
EversinceEarthformedroughly4.5billionyearsago,itsclimatehasgonethroughanumberofincrediblechanges.AllyouhavetodoislookatimagesoftheJurassicPeriod(侏罗纪时期)toknowthatatonetime,muchofourplanetwascoveredinextremelyhotandhumidjungle.Skipaheadacouplemillionyearsandyougettoaniceageevent,whenglobaltemperatureexperiencedahuge...
根据最后一段中“Depending on the species, it can take anywhere from one generation to thousands and thousands of years to properly adapt, so the changes that have occurred in just the last 40 years are very troubling for scientists.(根据物种的不同,它可能需要一代人到几千年的时间来适当适应,...
But the best thing about it is that, unlike coal and gas, it doesn't run out. The Solar Impulse plane could pretty much keep flying forever. Of course, the sun's light will eventually run out too one day, but not for another 5 billion years. That's a pretty long flight. 1. The...