地球大氣圈的變化英文版-文庫吧資料
2025-03-28 04:57本頁面
【正文】 lionth 106 milli onethousandth 103 centi onehundredth 102 deci onetenth 101 deka ten 101 10 hecto one hundred 102 100 kilo one thousand 103 1000 mega one million 106 1000000 giga one billion 109 1000000000 … yotta 1024 The Universe ? The Universe is made up of voids and filaments, that can be broken down into superclusters, clusters, galaxy groups, galaxies, and subsequently into stars and their constituents (. our Solar System). Hubble (2022) view – each light speck is a galaxy – some of these are as old as billion years – the Universe is estimated to contain 200 billion galaxies. Our Milky Way galaxy Our solar system is in the Orion arm, and we are about 25,000 light years ( X 1017 miles) from the very center of the Galaxy. Life cycle of the Sun and Earth The earth will be inhabitable for another billion years, if we protect it well enough. After another 1 billion years, all oceans and rivers will have pletely disappeared. The mean global temperature will reach 160 F. Formation of the Earth ? billion years ago, as part of the birth of the solar system Earth’s first Atmosphere ? Topic of much debate ? Probably H and He, no oxygen ? No oceans ? No magic field to deflect solar winds and
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