Have you ever wondered why an apple falls down from a tree instead of floating up into the sky? The answer is gravity. Gravity is an invisible force that pulls objects toward each other. On Earth, gravity pulls everything toward the center of the planet. This is why our feet stay on the ground and why things fall when we drop them.
The most famous story about gravity involves a scientist named Isaac Newton. Legend says he was sitting under an apple tree when an apple fell on his head. This made him think about why the apple moved straight down. He eventually realized that the Earth has a powerful pull. However, gravity is not just on Earth. Every object in the universe that has mass also has gravity.
The amount of gravity depends on two main things: mass and distance. Mass is the amount of matter in an object. Larger objects, like planets, have much stronger gravity than smaller objects, like rocks. Distance also matters. The closer you are to an object, the stronger its pull. This is why the Moon stays in orbit around the Earth. The Earth's gravity is strong enough to keep the Moon from drifting away into deep space.
Without gravity, life would be impossible. There would be no atmosphere for us to breathe because the air would float away. Even the Earth itself would not stay together. Understanding gravity is a key part of science that helps us build airplanes, send satellites into space, and learn more about the stars.
The Mystery of Gravity
中文翻譯
你是否曾經好奇過，為什麼蘋果是從樹上掉下來，而不是漂浮到天空中？答案是萬有引力（重力）。引力是一種無形的力量，它將物體互相吸引。在地球上，引力將一切事物推向行星的中心。這就是為什麼我們的腳能踩在地面上，以及為什麼我們丟下東西時它們會往下掉。關於引力最著名的故事涉及一位名叫艾薩克·牛頓的科學家。傳說他坐在蘋果樹下時，一個蘋果掉在他的頭上。這讓他思考為什麼蘋果是筆直向下移動的。他最終意識到地球有一種強大的吸引力。然而，引力不僅存在於地球上。宇宙中任何具有質量的物體都具有引力。
引力的大小取決於兩個主要因素：質量和距離。質量是物體中物質的量。巨大的物體（如行星）比微小的物體（如岩石）具有更強的引力。距離也很重要。你離一個物體越近，它的吸引力就越強。這就是為什麼月球會停留在繞地球運行的軌道上。地球的引力足以防止月球漂移到深太空中。
沒有引力，生命將是不可能的。我們將沒有空氣可以呼吸，因為空氣會漂走。甚至地球本身也無法維持在一起。了解引力是科學的一個關鍵部分，它幫助我們建造飛機、將衛星送入太空，並了解更多關於恆星的知識。
🔑 重點單字 (Vocabulary)
- gravity n.. 引力；重力
- invisible adj.. 看不見的；無形的
- object n.. 物體；目標
- center n.. 中心
- universe n.. 宇宙
- mass n.. 質量
- distance n.. 距離
- orbit n.. 軌道
- impossible adj.. 不可能的
- satellite n.. 衛星
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