We know the Moon is our satellite（卫星）. It ________ round the Earth day and night. It ________ around once a month, every 29 and a half days.

The Moon is our ________ neighbour in space. It is ________ than the Earth. Plants can’t grow on the Moon ________ there is no air on it.

The Moon hasn’t ________ own light. It shines back the light of the Sun. When the Sun is shining on one side of the Moon, it looks like ________ big bright round ball. We can’t see the Moon when the Sun is shining on ________ side.

In fact, the Moon isn’t as near as it looks. It’s difficult for scientists to study on the Moon, but they will never stop ________ on it. I hope one day, we can take a trip to the Moon. It must be fun ________ into space.

Scientists think that there has been life on the earth for hundreds of millions of years. However, we ________ life on any other planets yet.

The earth is ________ planet and it goes around the sun. Seven other planets also go around the sun. ________ of them has an environment like that of the earth, so scientists do not think they will find life on them. The sun and its planets are called the solar system, and our solar system is a small part of a much ________ group of stars and planets, called the Galaxy or the Milky Way. There are billions of stars in the Galaxy, and our sun is only one of them.

Scientists have also discovered many other ________ in the universe. They are very far away and their light has to travel ________ many years to reach us. So how large is the universe? It is impossible to imagine.

Scientists have sent spaceships to the planet Mars ________ photos. They have even sent spaceships to travel outside the solar system. However, no spaceship has travelled far enough to reach other stars in our Galaxy.

Scientists have always asked the questions: with so many stars in the universe, are we alone, ________ is there life out there in space? Have there been visitors to the earth from other planets? ________ has no one communicated with us? We haven’t known the answers ________   .

How many things can you see in the night sky? A lot! ______ a clear evening you might see the Moon and some planets. And ______ sparkling stars can be seen, too.

You can see even ______ with a telescope. You might see stars where you only saw dark space before. You might see ______ many stars look much larger than others. You might see some stars look white are really red and blue ______.

But scientists believe there are some ______ things in the sky that we never see. We ______ see them with the biggest telescope in the world, even when it is the clearest night of the year. That’s because they are the dead stars, which ______ black holes. You might find ______ hard to imagine stars die. After all, our Sun is a star. Year after year we see it burning ______ in the sky, giving us heat and light. The Sun doesn’t seem ______ getting old or weak. ______, stars do burn out and die after billions of years. As a star’s gases are ______, they give off light and heat. But when the gases run out, the star stops ______ and begins to die.

So the next time you stare up at the amazing night sky, remember: there is more in the sky than that meets the eye. ______ wonderful place it is!