Probably it began as a huge globe of gas and dust. The globe became smaller and denser,and most of the gas drifted away leaving behind bodies of solid matter.

• 可能起源于一个由气体和尘埃组成的庞大球体，后来这个球体体积逐渐缩小，密度增大，大部分气体飘散，留下一块块固态物质。