Earth

Earth (or the Earth) is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System’s four terrestrial planets. It is sometimes referred to as the World, the Blue Planet,[note 6] or by its Latin name, Terra.[note 7]

Home to millions of species[17] including humans, Earth is currently the only place in the universe where life is known to exist. The planet formed 4.54 billion years ago,[18] and life appeared on its surface within a billion years. Since then, Earth’s biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth’s magnetic field, blocks harmful solar radiation, permitting life on land.[19] The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist during this period. Without intervention, the planet could be expected to continue supporting life for between 0.5[20] and 2.3 billion[21] years, after which the rising luminosity and expansion of the Sun—as a result of the gradual but inexorable depletion of its hydrogen fuel—would eventually eliminate the planet’s biosphere.[22]

density
KK [ˋdɛnsətɪ], DJ [ˋdensiti]
1. 密集(度), 稠密(度)[U][C]
2.【物】【化】密度[U]

「類地行星」(terrestrial planet)
一般來說,水星、金星和火星的構成和地球很相似,是有山、有石的堅硬球體,所以被歸類為「類地行星」(terrestrial planet)。九大行星如果以它們的特徵來分,可大致分為兩類:較接近太陽的的四顆行星,水星、金星、地球及火星稱為類地行星,它們的共同特徵是由多種岩石礦物及金屬組成,體積小、質量小而密度大,自轉較慢,有固態表面。至於小行星帶外之四顆行星,木星、土星、天王星、海王星稱為類木行星,它們表面大氣的主要成份是氫,其次是氦,體積大、質量大而密度小,自轉速度快,沒有顯著的固態表面。此外,離太陽最遠的冥王星體積小,質量也小,而密度約為水的二倍。

billion
KK [ˋbɪljən], DJ [ˋbiljən]
1. (美國, 法國)十億

biosphere
KK [ˋbaɪə͵sfɪr], DJ [ˋbaiə͵sfiə]
生物圈

phere
KK [sfɪr], DJ [sfiə]
1. 球; 球體; 球形; 球面
2. 範圍, 領域

abiotic
KK [͵ebaɪˋɑtɪk], DJ [͵eibaiˋɔtik]
無生命的

biotic
KK [baɪˋɑtɪk], DJ [baiˋɔtik]
有關生命的; 生物的

proliferation
KK [prə͵lɪfəˋreʃən], DJ [prə͵lifəˋreiʃən]
【生】增殖

proliferate
KK [prəˋlɪfə͵ret], DJ [prəˋlifəreit]
【生】(使)增殖; (使)激增; (使)擴散

aerobic
KK [eəˋrobɪk], DJ [ɛəˋrɔbik]
1. 需氧的; 有氧的

aero-
KK [ˋɛro], DJ [ˋerəu]
1. 表示”空氣(的)”, “空中(的)”

organism
KK [ˋɔrgən͵ɪzəm], DJ [ˋɔ:gənizəm]
1. 生物, 有機體

好氧性生物 (Aerobic organism)

ozone
KK [ˋozon], DJ [ˋəuzəun]
1. 臭氧

地球磁場 (Earth’s Magnetic Field)

geologic
KK [dʒɪəˋlɑdʒɪk], DJ [dʒiəˋlɔdʒik]
地質學上的, 地質的

geology
KK [dʒɪˋɑlədʒɪ], DJ [dʒiˋɔlədʒi]
1. 地質學

orbit
KK [ˋɔrbɪt], DJ [ˋɔ:bit]
1. (天體等的)運行軌道[C][U]

persist
KK [pɚˋsɪst], DJ [pəˋsist]
1. 堅持; 固執[(+in/with)]
2. 持續; 存留

planetary engineering 行星工程

luminosity
KK [͵luməˋnɑsətɪ], DJ [͵lu:məˋnɔsəti]
光度

inexorable
KK [ɪnˋɛksərəb!], DJ [inˋeksərəbl]
1. 無法改變的; 不可阻擋的

exorable
KK [ˋɛksərəb!], DJ [ˋeksərəbl]
【罕】易說服的; 心腸軟的

depletion
KK [dɪˋpliʃən], DJ [diˋpli:ʃən]
耗盡

hydrogen fuel
氫燃料

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