Except Pluto, there ______ eight planets in the solar system now, including Earth. By the distance from the Sun from close ______ far, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto used to be known as the ______ planet in our solar system, and the furthest planet from the Sun. Pluto ______ in 1930, and was named by an eleven-year-old girl from England. Pluto is only half as ______ as the United States. This planet takes 248 earth years ______ around the sun. It means we need 6.5 earth days to ______ a day on Pluto. Pluto is about 40 times farther from the Sun than Earth is. Pluto is in an area of space called the Kuiper Belt ______ has thousands of small, icy objects. The temperature on Pluto is ______ low that Earth air would turn into ice soon. The gravity on Pluto is less strong than ______ on Earth. So fat persons may prefer to move there, they would weigh much less on Pluto.

In the universe, there is the earth, the moon, the sun, the stars and all other things too far away ________. The earth is one of the sun’s planets（行星）, and the moon is our satellite. The moon is about three hundred and eighty thousand kilometers away ________ the earth, but it’s our ________ neighbour in space. It ________ more than three days to get there by spaceship. No man ________ farther than the moon, but spaceships ________ people have reached other planets.

Of ________ the stars, the sun is the nearest to the earth. ________ other stars are even bigger and brighter than the sun. They look small only ________ they are much farther away. You ________ see them in the daytime. But if you go out at night, you’ll be able to see many of them.

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 _______, too.

You can see even _______ with a telescope. You might see stars where you only saw dark space before. You might see that many stars look larger than others. You might see that some stars _______ look white _______ really red or blue.

But scientists believe there are some things in the sky that we _______. We can’t see them with the biggest telescope in the world, even when it is the clearest night of the year. That’s _______ they’re invisible. They’re the mysterious dead stars and they _______ black holes. You might find ________ hard to imagine that stars die. After all, our Sun is a star. Year after year we see it up in the sky, burning brightly, giving us heat and light. The Sun certainly doesn’t seem ________ getting old or weak, ________ stars do burn out and die after billions of years. As a star’s gases burn, they give off light and heat. But when the gas runs ________, the star stops ________ and begins to die.

So the next time you stare up at the night sky, remember: there’s more in the sky than that meets the eye. ________ amazing space it is!