小行星、流星与陨石

竹墨韵风  |  编译

由岩石或金属矿物构成的小行星,主见于绕太阳运转、位于火星和木星间的小行星带中。有的很大——最大的为谷神星,外径近达600英里(966公里),而有时称之为小行星或类行星物体。存在数量成千上万。而最小的有时称之为流星体。据认为,小行星是星球形成时的残留物。

落进大气层的小行星称之为流星,在大气中残存下来、击中地球表面的则称之为陨石。

                ————译于2011年3月21日

                            修改于2019.8.23中午


附原文如下:

Asteroids are objects composed of rocky or metallic materials and are mainly found orbiting the Sun in a region called the asteroid belt between Mars and Jupiter. Some are large - the biggest is Ceres with a diameter of nearly 600 miles (966km) - and are sometimes called minor planets or planetoids. There are millions of small asteroids. The smallest are sometimes called meteoroids. It's thought that asteroids are material leftover from the time that the planets formed.

Objects falling through the Earth's atmosphere are called meteors. If they survive and hit the Earth's surface they are called meteorites.

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