1 Space Voyager Earth

Full of Life What is the third planet from the sun? Here are some hints. It is mostly water.

太阳之外的第三颗行星是什么？ 这里有一些提示。主要是水。

It has continents.

它有大陆。

It has one moon. It is Earth!

它有一个月亮。这是地球！

It spins. This makes day and night. The side that faces away from the sun is dark. This is night. The other side faces the sun. It is day here.

它旋转。这就有了白天和黑夜。 背向太阳的那一面是暗的。 这是夜晚。另一面面向太阳。 这里是白天。

It is the only planet known to have life. Why?

它是已知的唯一有生命的行星。 为什么?