On a clear night, the moon shines brightly overhead. You might think that the moon gives off light,
晴朗的夜晚，月亮照耀着头顶。你可能认为月球会发光，
but it does not. Light from the sun reflects off the moon’s surface. Sometimes the moon looks like a large ball steady in the sky. Other times it looks like a tiny sliver. Myths, or legends, were made up by early people to explain why the moon changes shape. The early people of Greenland thought the sun goddess was chasing her brother, the moon god, across the sky. Greenland is an island in North America. The moon god ran so much that he forgot to eat, so as days passed, he became thinner. Finally, the moon god had to stop and eat. He got bigger, and the chase began all over again. Today people understand why the shape of the moon changes. The changes in the shape of the moon are caused by the way the moon moves in space. The moon moves in two ways. It rotates, or spins around like a top. It takes the moon about twenty-nine days to rotate once. It also travels in a path around the earth called an orbit. The different shapes of the moon are called phases. This is what the phases of the moon look like:
，但事实并非如此。太阳光从月球表面反射出来。有时月亮看起来像一个大球在天空中稳定。有时它看起来像一条小银条。神话，或传说，是由早期的人编造来解释月亮为什么会改变形状。格陵兰岛早期的人们认为太阳女神在天空中追逐她的兄弟月亮神。格陵兰岛是北美的一个岛屿。月亮神跑得太多，以至于他忘了吃饭，所以随着时间的推移，他变得越来越瘦。最后，月亮神不得不停下来吃饭。他变大了，追逐又开始了。今天人们明白了为什么月亮的形状会改变。月球形状的变化是由月球在太空中的运动方式引起的。月球有两种运动方式。它像陀螺一样旋转。月球旋转一次大约需要29天。它也沿着一条环绕地球的轨道运行。月球的不同形状被称为相位。这就是月亮相位的样子：
full
个月占888个百分点，一半是月亮，88个88个百分点，万宁88个88个百分点，WaGeang-888。88%，月亮的相位依次是：
个完整，
half moon
的宇航员将月球照片送回地球。宇航员把月球岩石带回地球。从岩石中，科学家们学到了很多关于月球的知识。这些岩石是科学家可以研究月球是如何形成的证据。科学家认为月球可能曾经是地球的一部分。他们认为数百万年前一个来自太空的大型物体撞击地球。来自地球的尘埃和灰烬进入太空，形成了月球。从早期起人们就对月球有了很多了解！
个衰变凸起，
个半月，
waxing
个新月，
The phases of the moon in orderare:
个新月，
full,
个新月形新月形，
waning gibbous,
个半月形，
half moon,
半月
个蜡状凸起，
和满月。
new moon,
吉布斯
waxing crescent,
新月
half moon,
半月
个蜡状凸起，
waxing gibbous,
新月
and full.
新月
gibbous
月球绕地球运行大约需要29天。太阳总是照亮月亮的一半。我们并不总是看到地球的另一半。当你看到月亮的一半被照亮时，月亮看起来是一个完整的圆。这叫满月。当月球绕地球运行时，我们看到的被照亮的部分越来越少。这叫做月亏。很快，月亮被照亮的部分就消失了。这叫做新月。然后月亮又开始变亮了，你看到的被照亮的部分每天都变大。这就是所谓的月亮。所有阶段大约需要29天。这与月球绕地球飞行
crescent
的神话或传说是由早期的人编造的，用来解释月亮为什么会改变形状。格陵兰岛是北美的一个岛屿，早期的人们认为太阳女神在天空中追逐她的兄弟月亮神。月亮神跑得太多，以至于他忘了吃饭，所以随着时间的推移，他变得越来越瘦。最后，月亮神不得不停下来吃饭。他变大了，追逐又开始了。
所需的时间相同。从20世纪50年代开始，宇宙飞船被派去研究月球。宇宙飞船绕月球运行。通过这种方式，科学家们对月球的了解越来越多。然后，在1969年7月20日，第一艘搭载宇航员的宇宙飞船真的降落在月球上！人们可以看到一个人第一次在月球表面行走，那是在电视上！
half moon
的宇航员将月球照片送回地球。宇航员把月球岩石带回地球。从岩石中，科学家们学到了很多关于月球的知识。这些岩石是科学家可以研究月球是如何形成的证据。科学家认为月球可能曾经是地球的一部分。他们认为数百万年前一个来自太空的大型物体撞击地球。来自地球的尘埃和灰烬进入太空，形成了月球。从早期起人们就对月球有了很多了解！
个衰变凸起，
new
晴朗的夜晚，月亮在头顶闪耀。你可能认为月亮会发光，但事实并非如此。太阳光从月球表面反射出来。有时月亮看起来像天空中的一个大球。另一些时候，它看起来像一条小银条。
crescent
的神话或传说是由早期的人编造的，用来解释月亮为什么会改变形状。格陵兰岛是北美的一个岛屿，早期的人们认为太阳女神在天空中追逐她的兄弟月亮神。月亮神跑得太多，以至于他忘了吃饭，所以随着时间的推移，他变得越来越瘦。最后，月亮神不得不停下来吃饭。他变大了，追逐又开始了。
所需的时间相同。从20世纪50年代开始，宇宙飞船被派去研究月球。宇宙飞船绕月球运行。通过这种方式，科学家们对月球的了解越来越多。然后，在1969年7月20日，第一艘搭载宇航员的宇宙飞船真的降落在月球上！人们可以看到一个人第一次在月球表面行走，那是在电视上！
The moon takes about twenty-nine days to orbit around the earth. The sun always lights up half of the moon. We do not always see the lit-up half from the earth. When you see all the lit-up half of the moon, the moon appears to be a full circle. This is called the full moon. As the moon travels around the earth, we see less and less of the lit part. This is called the waning moon. Soon the lit-up part of the moon disappears from sight. This is called the new moon. Then the moon starts to look lit up again, and the lit part that you see gets bigger each day. This is called the waxing moon. It takes about twenty-nine days for all the phases. That’s the same amount of time it takes for the moon to make one
的人现在明白了为什么月亮的形状会改变。月球形状的变化是由月球在太空中的运动方式引起的。月球有两种运动方式。它像陀螺一样旋转。月球旋转一次大约需要29天。它也沿着一条环绕地球的轨道运行。月球的不同形状被称为相位。这就是月亮相位的样子：饱满、蜡状凸起、半月、衰弱、打蜡。月亮的顺序依次是：满月、新月形、新月形、新月形、新月形、半月形、蜡状凸起和饱满。
trip around the earth. Starting in the 1950s, spacecraft were sent to study the moon. The spacecraft orbited the moon. In this way, scientists learned more and more about the moon. Then, on July 20, 1969, the first spacecraft carrying astronauts from the earth actually landed on the moon! People were able to watch as a person walked on the moon’s surface for the first time ever.It was on television!
月亮绕地球轨道运行约二十九天。太阳总是照亮月亮的一半。我们并不总是看到从地球上照亮的那一半。当你看到月亮的一半被照亮时，月亮看起来是一个完整的圆。这叫满月。当月球绕地球运行时，我们看到的被照亮的部分越来越少。这叫做月亏。很快，月亮被照亮的部分就消失了。这叫做新月。然后月亮又开始变亮了，你看到的被照亮的部分每天都变大。这就是所谓的月亮。所有阶段大约需要29天。这与月球绕地球一圈所需的时间相同。从20世纪50年代开始，有
The astronauts sent the pictures of the moon back to the earth. The astronauts brought moon rocks back to the earth. From the rocks, scientists have learned a lot about the moon. The rocks were evidence that scientists could study to find out how the moon might have been formed. Scientists think the moon might once have been part of the earth. They think a large object from space hit the earth millions of years ago. The dust and ashes from the earth went into space and formed the moon. People have learned a lot aboutthe moon since early times!
的人被派去研究月球。宇宙飞船绕月球运行。通过这种方式，科学家们对月球的了解越来越多。然后，在1969年7月20日，第一艘搭载宇航员的宇宙飞船真的降落在月球上！人们能够看到一个人首次在月球表面行走。是在电视上！
On a clear night, the moon shines brightly overhead. You might think that the moon gives off light, but it does not. Light from the sun reflects off the moon‘s surface. Sometimes the moon looks like a large ball in the sky. Other times it looks like a tiny sliver.
的宇航员将月球照片送回地球。宇航员把月球岩石带回地球。从岩石中，科学家们学到了很多关于月球的知识。这些岩石是科学家可以研究月球是如何形成的证据。科学家认为月球可能曾经是地球的一部分。他们认为数百万年前一个来自太空的大物体撞击地球。来自地球的尘埃和灰烬进入太空，形成了月球。从早期起人们就对月球有了很多了解！
Myths, or legends, were made up by early people to explain why the moon changes shape. The early people of Greenland which is an island in North America thought the sun goddess was chasing her brother, the moon god, across the sky. The moon god ran so much that he forgot to eat, so as days passed, he became thinner. Finally, the moon god had to stop and eat. He got bigger, and the chase began all over again.
Today people understand why the shape of the moon changes. The changes in the shape of the moon are caused by the way the moon moves in space. The moon moves in two ways. It rotates, or spins around like a top. It takes the moon about twenty-nine days to rotate once. It also travels in a path around the earth called an orbit. The different shapes of the moon are called phases. This is what the phases of the moon look like:full, waxing gibbous, half moon, waning, waxing. The phases of the moon in order are: full, waning gibbous, half moon, crescent, new moon, waxing crescent, half moon, waxing gibbous, and full.
The moon takes about twenty-nine days to orbit around the earth. The sun always lights up half of the moon. We do not always see the lit-up half from the earth. When you see all the lit-up half of the moon, the moon appears to be a full circle. This is called the full moon. As the moon travels around the earth, we see less and less of the lit part. This is called the waning moon. Soon the lit-up part of the moon disappears from sight. This is called the new moon. Then the moon starts to look lit up again, and the lit part that you see gets bigger each day. This is called the waxing moon. It takes about twenty-nine days for all the phases. That’s the same amount of time it takes for the moon to make one trip around the earth.
Starting in the 1950s, spacecraft were sent to study the moon. The spacecraft orbited the moon. In this way, scientists learned more and more about the moon. Then, on July 20, 1969, the first spacecraft carrying astronauts from the earth actually landed on the moon! People were able to watch as a person walked on the moon’s surface for the first time ever. It was on television!
The astronauts sent the pictures of the moon back to the earth. The astronauts brought moon rocks back to the earth. From the rocks, scientists have learned a lot about the moon. The rocks were evidence that scientists could study to find out how the moon might have been formed. Scientists think the moon might once have been part of the earth. They think a large object from space hit the earth millions of years ago. The dust and ashes from the earth went into space and formed the moon. People have learned a lot aboutthe moon since early times!
的人被派去研究月球。宇宙飞船绕月球运行。通过这种方式，科学家们对月球的了解越来越多。然后，在1969年7月20日，第一艘搭载宇航员的宇宙飞船真的降落在月球上！人们能够看到一个人首次在月球表面行走。是在电视上！