摘要：在1687年，牛頓在他的《自然哲學的數學原理》一書中發表了萬有引力定律。牛頓的萬有引力定律的陳述如下： Every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. （宇宙中每個質點都以一種力吸引其他各個質點。這種力與各質點的質量的乘積成正比，與它們之間距離的平方成反比。）