读霍金感悟9 weipingdong blog
物体运动学
伽利略牛顿
亚里士多德
物体静止说
kinematics of objects galileo， newton
aristotle
say a particle at rest
降落速度异
重力加速度
空气有阻力
引力参照物
landing speed difference acceleration
air resistance
gravity reference
地球的轨道
稳定椭圆形
脱离与接近
质量的原因
the earth's orbit
stable oval
detachment and close quality reasons
月球无空气
降落物同速
地球大气层
的确是特殊
the moon has no air
things fall down with one speed
the earth's atmosphere
it's special
在月球上物质降落是同样的速度，地球上的大气层跟引力是地球人的福音也是盲音，因为这让人类不解，为何星球悬在空中，而人只能站在地上?
to land on the moon is the same speed， and the earth's atmosphere and gravity are the gospel also blind sound the earth， because it makes people wonder why the planet is hanging in the air， and people can only stand on the ground?m.