我们看到的流星仅仅只有豌豆大小,从地球大气圈劫后余生的陨星则大得多。每天至少有10颗重量超过1千克的陨星砸到地球表面,但我们几乎看不见。陨石是一种行星际物质碎片,有的灰尘般大小,有的直径达数千米,它的轨道极不稳定,每天有无数颗砸到地球表面。地球物理专家指出,一个相当不起眼的小行星若与地球发生碰撞,有可能 The meteors we see are only the size of peas. The comets that survived the Earth’s atmosphere are much larger. Every day at least 10 comets weighing more than 1 kilogram hit the surface of the Earth, but we can barely see it. Meteorite is an interplanetary material debris, some dust-sized, some thousands of meters in diameter, its orbit is extremely unstable, and there are countless particles that hit the surface of the earth every day. Geophysicists point out that if a fairly obscure asteroid collides with Earth, it is possible that